Not able to work with images - Mosaico+PHP(Xampp)

[vencoder]

Hello Mark,
First things first, would like to thank you for maintaining the mosaico-php-backend.

I have a xampp setup on Windows 7 and I have copied the mosaico files under a folder named moss under xampp/htdocs. I don't have Node running at present. I just copied the entire build files that were created after successfully building mosaico under xampp/htdocs. I tested mosaico with node and I could upload images, list them etc. It worked perfectly.

The set up looks like this - xampp/htdocs/moss

I copied the contents of mosaico-php-backend under moss and ended up with directories dl, upload and img. The .htaccess files have been left unchanged.

I copied backend-php as is under xampp/htdocs/moss and this is what it looks like - xampp/htdocs/moss/backend-php
Should I leave config.php under backend-php or should I move it to the application root folder, ie, xampp/htdocs/moss?

I think I haven't quite understood how config.php should be edited. I am copy pasting the entire contents of my config.php here. Would be grateful if you can direct me in the right way to setting the respective paths.

/* note that all _URL and _DIR configurations below must end with a forward slash (/) /
$config = [
/ Url for image serving in final download /
SERVE_URL => "http://localhost/moss/img/",
/ Base Url for accessing Mosaco */
BASE_URL => "http://localhost/moss/",

/* local file system base path to where image directories are located */
//BASE_DIR => "/var/www/mosaico/",
BASE_DIR => "file:///d:/xampp/htdocs/moss/",
/* url to the uploads folder (relative to BASE_URL) */
UPLOADS_URL => "uploads/",

/* local file system path to the uploads folder (relative to BASE_DIR) */
//UPLOADS_DIR => "uploads/",
UPLOADS_DIR => "file:///d:/xampp/htdocs/moss/uploads/",
/* url to the static images folder (relative to SERVE_URL) */
STATIC_URL => "media/newsletter/static/",
/* local file system path to the static images folder (relative to BASE_DIR) */
//STATIC_DIR => "uploads/static/",
STATIC_DIR => "file:///d:/xampp/htdocs/moss/uploads/static/",
/* url to the thumbnail images folder (relative to BASE_URL */
THUMBNAILS_URL => "uploads/thumbnail/",

/* local file system path to the thumbnail images folder (relative to BASE_DIR) */
//THUMBNAILS_DIR => "uploads/thumbnail/",
THUMBNAILS_DIR => "file:///d:/xampp/htdocs/moss/uploads/thumbnail/",
/* width and height of generated thumbnails */
THUMBNAIL_WIDTH => 90,
THUMBNAIL_HEIGHT => 90

];

I haven't quite understood what SERVE_URL points to.

Aside, the Console flashes error message each time I try to add a block to the designer & image upload/add fails with the following response message -
Notice: Use of undefined constant SERVE_URL - assumed 'SERVE_URL' in D:\xampp\htdocs\moss\backend-php\config.php on line 5

I have noticed that there is no SERVE_URL in index.php. The rest of the variables used in config.php have been assigned an index value in index.php though.

I still don't know what SERVE_URL should point to. An example suited for windows would really help.

Thank you & Regards!