I’ve tried logging out and back in, and clearing the cache. I can browse my site fine, but as soon as I try and replace a file, this error generates again.
I am using Concrete version 8.5.4 and PHP version 7.3. I have not made any major changes to my site, file storage, or browser. This just randomly started today.
Does anyone have any idea why this is happening and some possible fixes to try?