diff --git a/CHANGELOG.md b/CHANGELOG.md
index cddbe690..a52f7398 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,61 @@
 # Changelog
 
 
-## 1.4.7 (2023-06-24)
+## v1.4.8 (2023-10-22)
+
+### New
+
+* Added support for `drawio` diagram extension (#131) [Michele Tessaro]
+
+### Fix
+
+* Fixes wrong number of arguments exception. [Liane Hampe]
+
+  The macro drawio_dmsf will raise an exception when a user applies
+  the macro to a previously uploaded drawio file (file ending does not
+  matter).
+
+  The error occurs in DmsfFileRevision#disk_file which has changed four
+  month ago.
+
+* Fixes uncaught type error. [Liane Hampe]
+
+  Math support will only be provided if the user has checked the
+  corresponding box in plugin settings. When no math support is required
+  the javascript snippet should be ignored.
+
+  Since only MathJax will be ignored and not MathJax.Hub, javascript will
+  raise a type error. This is fixed with a further condition.
+
+### Other
+
+* Adds some unit tests. [Liane Hampe]
+
+  Will add some unit tests for drawio macros.
+
+* Extends error message. [Liane Hampe]
+
+  The extension drawio is missing in an error message listing supported
+  diagram formats.
+
+* Changes spelling in heredoc string. [Liane Hampe]
+
+  Will remove inverted comma (') from heredoc string since there are
+  interpreted as the beginning of a normal string
+  ('text between inverted comma') which won't be closed.
+
+  The results is an unreadable code in some IDE such that vscode.
+
+* Changes spelling in heredoc string. [Liane Hampe]
+
+  Will remove inverted comma (') from heredoc string since there are
+  interpreted as the beginning of a normal string
+  ('text between inverted comma') which won't be closed.
+
+  The results is an unreadable code in some IDE such that vscode.
+
+
+## v1.4.7 (2023-06-24)
 
 ### Fix
 
diff --git a/README.md b/README.md
index 871cbd0b..e2358a03 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,7 @@ This macro handles diagrams saved as attachments of issues or wiki pages.
 
 The supported diagrams format are:
 * `xml`: normal diagram source in XML format
+* `drawio`: an alias for `xml`, used to load exported diagrams from the [online ditor](https://app.diagrams.net/) without changing the file extension
 * `png`: PNG image with an embedded XML source of the diagram (PNG+XML)
 * `svg`: SVG image with an embedded XML source of the diagram (SVG+XML)
 
diff --git a/app/views/redmine_drawio/_macro_dialog.html.erb b/app/views/redmine_drawio/_macro_dialog.html.erb
index fbf369f4..3e1e2d71 100644
--- a/app/views/redmine_drawio/_macro_dialog.html.erb
+++ b/app/views/redmine_drawio/_macro_dialog.html.erb
@@ -15,6 +15,7 @@
           <input type="radio" name="drawio_diagType" value="svg" style="margin-left:1em"/>SVG
           <% end %>
           <input type="radio" name="drawio_diagType" value="xml" style="margin-left:1em" id="drawio_diagTypeXml"/>XML
+          <input type="radio" name="drawio_diagType" value="drawio" style="margin-left:1em" id="drawio_diagTypeXml"/>DRAWIO
         </p>
         <p>
           <label for="drawio_size"><%= l(:drawio_dlg_size) %></label>
diff --git a/assets/javascripts/drawioEditor.js b/assets/javascripts/drawioEditor.js
index f2a643af..47ae6a40 100644
--- a/assets/javascripts/drawioEditor.js
+++ b/assets/javascripts/drawioEditor.js
@@ -45,6 +45,13 @@ function editDiagram(image, resource, isDmsf, pageName, originalName) {
                            '<svg preserve_aspect_ratio="xMaxYMax meet" style="max-width:100%" width="$2px" height="$3px" viewBox="0 0 $2 $3" $1');
     }
 
+    function getLang() {
+        if(navigator.languages) {
+            return navigator.languages[0];
+        }
+        return navigator.language;
+    }
+
     var pngMime   = 'image/png';
     var svgMime   = 'image/svg+xml';
     var xmlMime   = 'application/xml';
@@ -349,6 +356,90 @@ function editDiagram(image, resource, isDmsf, pageName, originalName) {
                     return body.match(new RegExp(macroRegExp));
                 }
 
+                /**
+                 * Updates the list of attachments without reloading the page.
+                 * Since some text is language dependente, we get the last attachment in the page
+                 * and replace the the infos with those from the new attachment.
+                 */
+                function updateAttachmentList() {
+                    // Re-read the page to retrieve the list of attachments
+                    $.ajax({
+                        url     : pageUrl+'.json',
+                        type    : 'GET',
+                        dataType: 'json',
+                        headers : { 'X-Redmine-API-Key': getHash() },
+                        data    : {include: 'attachments'},
+                        error   : showError,
+                        success : function(page) {
+                            page = page.wiki_page? page.wiki_page: page.issue;
+                            if(page && page.attachments) {
+                                var lastAttach    = page.attachments[page.attachments.length-1];
+                                var attachTable   = $(".attachments table tbody");
+
+                                if(attachTable.length == 0) {
+                                    $("#wiki_add_attachment").before('<div class="attachments"><table><tbody></tbody></table></div>');
+                                    attachTable   = $(".attachments table tbody");
+                                }
+
+                                var lastRow       = attachTable.find('tr').last();
+                                var hrefCount     = 0;
+                                var linkTextCount = 0;
+                                var lastRowHtml   = $(lastRow).html();
+
+                                if(!lastRowHtml) {
+                                    lastRowHtml = '<td>'
+                                                + '    <a class="icon icon-attachment" href="/redmine/attachments/00" data-bcup-haslogintext="no">NAME</a>    <span class="size">(SIZE KB)</span>'
+                                                + '    <a class="icon-only icon-download" title="Download" href="/redmine/attachments/download/00/NAME" data-bcup-haslogintext="no">NAME</a>  </td>'
+                                                + '  <td></td>'
+                                                + '  <td>'
+                                                + '      <span class="author">USER, TIMESTAMP</span>'
+                                                + '  </td>'
+                                                + '  <td>'
+                                                + '      <a data-confirm="Are you sure ?" class="delete icon-only icon-del" title="Delete" rel="nofollow" data-method="delete" href="/redmine/attachments/00" data-bcup-haslogintext="no">Delete</a>'
+                                                + '  </td>';
+                                }
+                                // replace icon link
+                                lastRowHtml = lastRowHtml.replace(/href="[^"]+"/g, function(match) {
+                                    var path = lastAttach.content_url.substring(0, lastAttach.content_url.indexOf('/attachments/download/')+'/attachments'.length);
+
+                                    //var path = lastAttach.content_url.substring(0, lastAttach.content_url.lastIndexOf('/'));
+
+                                    //path = path.substring(0, path.lastIndexOf('/'));
+
+                                    switch(hrefCount++) {
+                                        case  0:
+                                        case  2: return 'href="'+path+'/'+lastAttach.id+'"';
+                                        case  1: return 'href="'+lastAttach.content_url+'"';
+                                        default: return match;
+                                    }
+                                });
+                                // replace file size
+                                lastRowHtml = lastRowHtml.replace(/\((.*?) KB\)/, '('+(lastAttach.filesize/1024).toFixed(2)+' KB)');
+                                // replace file name
+                                lastRowHtml = lastRowHtml.replace(/>[^<]+<\/a>/g, function(match) {
+                                    if(linkTextCount++ < 2) {
+                                        return '>'+lastAttach.filename+'</a>';
+                                    } else {
+                                        return match;
+                                    }
+                                });
+                                // replace author and date
+                                var attachDate = new Date(lastAttach.created_on).toLocaleString();
+                                lastRowHtml = lastRowHtml.replace(/author">[^<]+/, 'author">'+lastAttach.author.name+', '+
+                                    attachDate.replaceAll('/', '-').substring(0, attachDate.lastIndexOf(':'))
+                                );
+                                // add the new attachment to the attachments list
+                                attachTable.append(lastRowHtml);
+                                // increment the number of attachments
+                                var numAttachs = $("fieldset legend");
+                                numAttachs.text(numAttachs.text().replace(/\d+/, function(match) {
+                                    return Number(match)+1;
+                                }));
+                            }
+                        }
+                    });
+                }
+
                 /**
                  * Fix for `{{fnlist}}` duplication with the `redmine_wiki_extensions` plugin.
                  */
@@ -364,7 +455,7 @@ function editDiagram(image, resource, isDmsf, pageName, originalName) {
                 }
 
                 /**
-                 * Fix for Wiki Extensions header page.
+                 * Fix for Wiki Extensions footer page.
                  */
                 function fixWikiExtensionsFooter(value) {
                     return value.replace(/\n\n<div id="wiki_extentions_footer">[\S\s]+?\n<\/div>$/gi, '');
@@ -417,7 +508,8 @@ function editDiagram(image, resource, isDmsf, pageName, originalName) {
                     dataType: 'text',
                     headers : { 'X-Redmine-API-Key': getHash() },
                     data    : data,
-                    error   : showError
+                    error   : showError,
+                    success : updateAttachmentList
                 });
             }
 
diff --git a/assets/javascripts/drawio_jstoolbar.js b/assets/javascripts/drawio_jstoolbar.js
index 18883ad6..b085b1f7 100644
--- a/assets/javascripts/drawio_jstoolbar.js
+++ b/assets/javascripts/drawio_jstoolbar.js
@@ -210,14 +210,14 @@
             
             if(diagName != '' && size.match(/^\d*$/)) {
                 // Add/replace file extension
-                diagName = diagName.replace(/^(.*?)(?:\.\w{3})?$/, '$1.'+diagType);
-                
+                diagName = diagName.replace(/^(.*?)(?:\.\w{3,6})?$/, '$1.'+diagType);
+
                 var options = [diagName];
                 
                 if(/^\d+$/.test(size))
                     options.push('size='+size);
                 
-                if(diagType === 'xml') {
+                if(diagType === 'xml' || diagType === 'drawio') {
                     var tbAutoHide = $("#drawio_tbautohide").is(":checked");
                     var lightbox   = $("#drawio_lightbox").is(":checked");
                     var zoom       = $("#drawio_zoom").is(":checked");
@@ -290,7 +290,9 @@
                         }
                     }
                     
-                    if($('input:radio[name=drawio_diagType]:checked').val() === 'xml')
+                    var selectedType = $('input:radio[name=drawio_diagType]:checked').val();
+
+                    if(selectedType === 'xml' || selectedType === 'drawio')
                         $("#drawio_xml_params").show();
                 }
             },
@@ -313,7 +315,7 @@
                 $("input[name=drawio__P1]").val(filename.replace(/\.[^/.]+$/, "")+"."+this.value);
             }
             
-            if(this.value === 'xml')
+            if(this.value === 'xml' || this.value === 'drawio')
                 $("#drawio_xml_params").show();
             else
                 $("#drawio_xml_params").hide();
diff --git a/init.rb b/init.rb
index 0686e4f2..9da89f3f 100644
--- a/init.rb
+++ b/init.rb
@@ -4,7 +4,7 @@
   name 'Redmine Drawio plugin'
   author 'Michele Tessaro'
   description 'Wiki macro plugin for inserting drawio diagrams into Wiki pages and Issues'
-  version '1.4.7'
+  version '1.4.8'
   url 'https://github.com/mikitex70/redmine_drawio'
   author_url 'https://github.com/mikitex70'
 
diff --git a/lib/redmine_drawio/macros.rb b/lib/redmine_drawio/macros.rb
index 6fa45dca..0ee1a88f 100644
--- a/lib/redmine_drawio/macros.rb
+++ b/lib/redmine_drawio/macros.rb
@@ -23,13 +23,14 @@ module Macros
 {{drawio_attach(myDiagram[, ...options...])}}
 
 The diagram is drawn from the attachment myDiagram.png (diagram esported as png+xml);
-if the attachment doesn't exists a default diagram wil be drawn. Double click it to start
+if the attachment does not exists a default diagram wil be drawn. Double click it to start
 editing.
 
 Supported diagrams format are:
 * png: diagram exported as png+xml (embedded source diagram)
 * svg: diagram exported as svg+xml (embedded source diagram)
 * xml: classic diagram xml source
+* drawio: same ax xml
 
 Every time a diagram is saved, a new attachment will be created; for now you must 
 manually delete old attachments (missing Redmine API; version 3.3.0 seems to have included
@@ -55,7 +56,7 @@ module Macros
                 diagramName   = RedmineDrawio::Macros.strip_non_filename_chars(args.first)
                 
                 return "«Please set a diagram name»".html_safe unless diagramName
-                return "«Only png, svg and xml diagram formats are supported»".html_safe unless diagramName =~ /.*(\.(png|svg|xml))?$/i
+                return "«Only png, svg and xml diagram formats are supported»".html_safe unless diagramName =~ /.*(\.(png|svg|xml|drawio))?$/i
                 return "svg diagrams are disabled by the administrator" unless RedmineDrawio::Macros.svg_enabled? || not(diagramName =~ /.*\.svg$/i)
                 
                 # defalts
@@ -177,13 +178,14 @@ module Macros
 {{drawio_dmsf(myDiagram[, ...options...])}}
 
 The diagram is drawn from the DMSF document myDiagram.png(diagram esported as png+xml);
-if the attachment doesn't exists a default diagram wil be drawn. Double click it to start
+if the attachment does not exists a default diagram wil be drawn. Double click it to start
 editing.
 
 Supported diagrams format are:
 * png: diagram exported as png+xml (embedded source diagram)
 * svg: diagram exported as svg+xml (embedded source diagram)
 * xml: classic diagram xml source
+* drawio: same ax xml
 
 The diagram name can contain a path. For example:
 
@@ -212,7 +214,7 @@ module Macros
                     diagramName   = RedmineDrawio::Macros.strip_non_filename_chars(args.first).force_encoding("UTF-8")
                     
                     return "«Please set a diagram name»".html_safe unless diagramName
-                    return "«Only png and svg diagram formats are supported»".html_safe unless diagramName =~ /.*(\.(png|svg))?$/i
+                    return "«Only png, svg, xml, and drawio diagram formats are supported»".html_safe unless diagramName =~ /.*(\.(png|svg|xml|drawio))?$/i
                     return "svg diagrams are disabled by the administrator" unless RedmineDrawio::Macros.svg_enabled? || not(diagramName =~ /.*\.svg$/i)
                     
                     # Add an extension, if missing
@@ -266,7 +268,7 @@ module Macros
                     
                     if file
                         # Document exists, get the file path
-                        filename = file.last_revision.disk_file project
+                        filename = file.last_revision.disk_file
                         canEdit  = canEdit && User.current && User.current.allowed_to?(:file_manipulation, file.project)
                     else
                         # Document does not exists: use a predefined diagram to start editing
@@ -314,7 +316,7 @@ module Macros
                             'toolbar'        => toolbar,
                             'xml'            => diagram
                         }
-                        return RedmineDrawio::Macros.encapsulateXml(graphOpts, inlineStyle, diagramName, title, saveName, false)
+                        return RedmineDrawio::Macros.encapsulateXml(graphOpts, inlineStyle, diagramName, title, saveName, true)
                     end
                 end
             end
@@ -462,7 +464,7 @@ def svg_enabled?
             end
 
             def pdf?(controller)
-                return false if controller.is_a?(Mailer)
+                return false if controller.is_a?(Mailer) || controller.nil?
 
                 controller.params[:format]
             end
diff --git a/spec/defaultImage.drawio b/spec/defaultImage.drawio
new file mode 100644
index 00000000..af1acccb
--- /dev/null
+++ b/spec/defaultImage.drawio
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<mxfile host="embed.diagrams.net" modified="2021-02-07T16:33:22.634Z" agent="5.0 (X11)" etag="Gs3lb32EfM7dQXgsjgK5" version="14.2.9" type="embed"><diagram name="Page-1" id="0">pZRLb4JAEMc/DXcEX71qq156Mk3PI4yw6bJjllG0n7677CAQ28SkHMjMbx77mD9E6bq6bi2cynfKUUdJnF+j9DVKkuVs7t4e3AKYTpcBFFblAU16sFffKDAWelY51qNEJtKsTmOYkTGY8YiBtdSM046kx6ueoMAHsM9AP9JPlXMpx0rmPd+hKspu5cn8JUQOkH0Vls5G1jNkMEQq6NrIGesScmoGKH2L0rUl4mBV1zVqf6vdjYW6zR/R+5YtGn6mII0XoeQC+iznjpK5dsWrXF2cWXjzo0Z/+yXKDA5gI985JB5sl9cRt+Cg+peGhzMzmbbbP7rUDJa9wiw0yhTPd2qvnm/dpJtSMe5PkHm/cWJ2SSVX2nkTZx7J8AYqpb2Qd6gvyCoDCYhuJ8vOl7a+sNUA5uKBzSR5FkvymjTZdg9p3D6OkwXjhbkqNNS11D7OVUZ9Qct4HSCZ8xapQrY3lyLRqUjuNnabXtpJLKwcyHohDORrKu6Ne1k5Q5TVub2C29jgB5G+/QA=</diagram></mxfile>
\ No newline at end of file
diff --git a/test/fixtures/files/test.xml b/test/fixtures/files/test.xml
new file mode 100644
index 00000000..e479b7db
--- /dev/null
+++ b/test/fixtures/files/test.xml
@@ -0,0 +1,13 @@
+<mxfile host="Electron" modified="2023-10-11T11:00:41.645Z" agent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/21.2.8 Chrome/112.0.5615.165 Electron/24.2.0 Safari/537.36" etag="ULU4UeZiMxyzgYXR3Rwl" version="21.2.8" type="device">
+  <diagram name="Seite-1" id="rn0qnA-JrJMqG2GYrRrw">
+    <mxGraphModel dx="2582" dy="1493" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="1169" pageHeight="827" math="0" shadow="0">
+      <root>
+        <mxCell id="0" />
+        <mxCell id="1" parent="0" />
+        <mxCell id="na-2I6SyCpFPVLIH_ADP-1" value="&lt;h1&gt;Test&lt;/h1&gt;&lt;p&gt;Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.&lt;/p&gt;" style="text;html=1;strokeColor=#82b366;fillColor=#d5e8d4;spacing=5;spacingTop=-20;whiteSpace=wrap;overflow=hidden;rounded=0;" vertex="1" parent="1">
+          <mxGeometry x="490" y="320" width="190" height="120" as="geometry" />
+        </mxCell>
+      </root>
+    </mxGraphModel>
+  </diagram>
+</mxfile>
diff --git a/test/unit/drawio_settings_helper_test.rb b/test/unit/drawio_settings_helper_test.rb
index 278bb97b..7bcf9784 100644
--- a/test/unit/drawio_settings_helper_test.rb
+++ b/test/unit/drawio_settings_helper_test.rb
@@ -11,6 +11,7 @@ class DrawioSettingsHelperTest < ActiveSupport::TestCase
 
     def teardown
       Setting.plugin_redmine_drawio = { drawio_svg_enabled: nil }
+      Setting.clear_cache
     end
 
     def test_svg_disabled
diff --git a/test/unit/lib/redmine_drawio/drawio_macros_test.rb b/test/unit/lib/redmine_drawio/drawio_macros_test.rb
new file mode 100644
index 00000000..f6e1250c
--- /dev/null
+++ b/test/unit/lib/redmine_drawio/drawio_macros_test.rb
@@ -0,0 +1,89 @@
+# frozen_string_literal: true
+
+# Copyright (C) 2023 Liane Hampe <liaham@xmera.de>, xmera Solutions GmbH.
+
+require File.expand_path('../../test_helper', File.dirname(__dir__))
+require File.expand_path('../../with_drawio_settings', File.dirname(__dir__))
+
+module RedmineDrawio
+  class DrawioMacrosTest < ActiveSupport::TestCase
+    include RedmineDrawio::WithDrawioSettings
+    include ApplicationHelper
+    include ActionView::Helpers
+    include ActionDispatch::Routing
+    include ERB::Util
+    include Rails.application.routes.url_helpers
+    include ActionView::Helpers::UrlHelper
+
+    fixtures :projects, :users, :email_addresses, :user_preferences, :members, :member_roles, :roles,
+             :groups_users,
+             :trackers, :projects_trackers,
+             :enabled_modules,
+             :versions,
+             :issue_statuses, :issue_categories, :issue_relations, :workflows,
+             :enumerations,
+             :issues, :journals, :journal_details,
+             :watchers,
+             :custom_fields, :custom_fields_projects, :custom_fields_trackers, :custom_values,
+             :time_entries
+
+    def setup 
+      @jsmith = User.find 2
+      @manager_role = Role.find_by(name: 'Manager')
+      @manager_role.add_permission! :view_dmsf_files
+      @project1 = Project.find 1
+      @project1.enable_module! :wiki
+
+      User.current = @jsmith
+      default_url_options[:host] = 'http://example.com'
+    end
+
+    def test_macro_drawio_deprecated 
+      text = textilizable("{{drawio(new-drawing.xml, hilight=#0000ff)}}")
+      assert_equal "<p>«The drawio macro is deprecated, use the drawio_attach macro instead»</p>", text 
+    end
+
+    def test_macro_drawio_attach_unsaved
+      text = textilizable("{{drawio_attach(new-drawing.xml, hilight=#0000ff)}}")
+      assert_equal "<p>«Please save content first»</p>", text
+    end
+
+    def test_macro_drawio_dmsf_unsaved
+      text = textilizable("{{drawio_dmsf(new-drawing.xml, hilight=#0000ff)}}")
+      assert_equal "<p>«Please save content first»</p>", text
+    end
+
+    def test_macro_drawio_dmsf_with_existing_document
+      return unless Redmine::Plugin.installed?(:redmine_dmsf)
+
+      file_name = 'test.xml'
+      prepare_dmsf_module(file_name)
+      
+      assert_nothing_raised do
+        result = exec_macro('drawio_dmsf', @obj, file_name, nil, hilight: '#0000ff')
+        assert result.match(file_name), "Macro result does not match #{file_name}!"
+      end
+
+      FileUtils.rm_rf DmsfFile.storage_path
+      rescue StandardError => e
+        puts e.message
+      ensure 
+        Setting.clear_cache
+    end
+
+    private
+
+    def prepare_dmsf_module(file_name)      
+      @project1.enable_module! :dmsf
+      Setting.plugin_redmine_dmsf['dmsf_storage_directory'] = File.join('files', ['dmsf'])
+      FileUtils.cp_r File.join(File.expand_path('../../../../fixtures/files', __FILE__), '.'), DmsfFile.storage_path
+      year = Date.today.year
+      month = Date.today.month
+      FileUtils.mkdir_p File.join(DmsfFile.storage_path, "#{year}/#{month}")
+      FileUtils.mv File.join(DmsfFile.storage_path, file_name), File.join(DmsfFile.storage_path, "#{year}/#{month}", file_name)
+      file = DmsfFile.create!(project_id: 1, name: file_name)
+      revision = DmsfFileRevision.create!(dmsf_file_id: file.id, name: file_name, disk_filename: file_name, user_id: @jsmith.id, title: 'Drawio test file', major_version: 1)
+      @obj = Issue.create!(project_id: 1, subject: 'Issue with drawio', status_id: 1, tracker_id: 1, author_id: @jsmith.id)
+    end
+  end
+end