WordPress Multisite Network Settings "Upload file types" Not Working

[rupok]

Steps to replicate:

• Create a fresh WordPress Multisite
• Go to My Sites > Network Admin > Settings
• Check the "Upload file types" option. "ttf" is not allowed there by default.
• Add "ttf" in that input field, Save.

Now try uploading a ttf file through the native media uploader. WordPress still won't allow uploading .ttf files.

Workaround:

• Add the following line in wp-config.php file and save:

  <?php
  define('ALLOW_UNFILTERED_UPLOADS', true);
  

Now you can upload .ttf files.

• Not only that, now you can upload files which have type not in the "Upload file types" settings.

Summary: "Upload file types" declarations are not working. The workaround is not a fix because it allows *all* extensions. Sorry if I'm doing, but am I missing anything?

[ocean90]

Hello @rupok, this Trac is only used for the WordPress.org site. For the WordPress core software please use ​https://core.trac.wordpress.org/.

But to answer your question: ttf is not part of the ​default mime types. You have to extend this list with the ​mime_types filter first.