I’m not a pro developer or anything but the problem has to do with the latest version of jQuery in WordPress 5.6. File manager is not compatible with this version.
Follow the steps below to fix the issue for now:
Step 1 – Download the plugin called Enable jQuery Migrate Helper. It’s made by the WordPress developers as a stop gap for several plugins with this issue. Activate the plugin.
Step 2 – In your Tools menu on the admin page, go to jQuery Migrate, and under settings change the jQwery version to Legacy 1.12.4-wp. Save changes. This will allow you to get to the main file manager window.
The WP developers stress that this is a stop-gap fix and could cause other issues later on, but it has worked very well for me thus far.
I use the file manager every time nearly every time I log into my website, so I really hope they fix this issue soon. Other than this rather major hiccup it has been a lifesaver.
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This reply was modified 3 years, 10 months ago by treefrog74.