[Solved] Advanced File Attachments doesn't work with WordPress 5.9
I use Advanced File Attachments. It's great and very convenient.
However, starting today, I am suddenly unable to attach images.
(I'm not sure when this actually started happening, but I noticed it today.)
When I drag and drop, nothing happens, and when I open "My Media", the loading animation is running forever.
The following error is output to the console.
core.min.js?ver=1.13.0:116 Uncaught TypeError: Cannot read properties of undefined (reading '_super')
Yes, I believe this is a problem since the WordPress 5.9 release. I'm having the same exact problem since WordPress automatically updated my site (I really despise the auto-update "feature" in WP and this is a perfect example of why).
To be perfectly clear, I've also cleared all server caches, wpForo caches and my own local browser caches. Here's a screencast to show the upload process... I'm allowed to select a file, but you'll see that it never actually uploads; then I check the console and see the same error as posted by @ddryo_loos above.
Here's another screencast showing what happens when I try to access My Media.