Share option is missing completely for all files after upgrade from owncloud

[DavidSporer]

Steps to reproduce

1. Log in to Nextcloud (10.0.1)
2. Select any file
3. Share option is missing completely

Expected behaviour

Tell us what should happen

I expect to see the option to share files e.g. via a link

Actual behaviour

Tell us what happens instead

The share options are missing.

Server configuration

Operating system:
Debian Linux
Web server:
Apache
Database:
MySQL
PHP version:
PHP 7.0.7
Nextcloud version: (see Nextcloud admin page)
10.0.1
Updated from an older Nextcloud/ownCloud or fresh install:
Update from ownCloud 8.2.7 to Nextcloud 9.0.50 to Nextcloud 10.0.1
Where did you install Nextcloud from:
nextcloud.com

The content of config/config.php:

Config report

$CONFIG = array (
  'instanceid' => 'ocv3mam84ce6',
  'passwordsalt' => '',
  'secret' => '',
  'trusted_domains' =>
  array (
    0 => 'cloud.passcreator.com',
  ),
  'datadirectory' => '/html/passcreator-cloud/data',
  'overwrite.cli.url' => 'http://cloud.passcreator.com',
  'dbtype' => 'mysql',
  'version' => '9.1.1.5',
  'installed' => true,
  'theme' => '',
  'maintenance' => false,
  'loglevel' => 2,
  'trashbin_retention_obligation' => 'auto',
  'dbname' => '',
  'dbhost' => '',
  'dbuser' => '',
  'dbpassword' => '',
);

Are you using external storage, if yes which one: local/smb/sftp/...
no
Are you using encryption: yes/no
no
Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...
no

Client configuration

Browser:
Chrome
Operating system:
Mac OS X Sierra

Logs

Web server error log

Web server error log

#### Browser log

Browser log

Uncaught TypeError: Cannot set property 'showAddExternalDialog' of undefined in external.js

[DavidSporer]

Sorry... Didn't know that Sharing is an app for itself.