Correct! I noticed the mbstring error on the plugin page.
Found the issue!
Cerber needs to have the mbstring option enabled in php to function correctly. All I had to do was provision a php package with mbstring included and I was good to go!
I apologize, I meant upload, not update.
Here’s exactly what happens:
I attempt to upload a file (image, pdf, doesn’t matter) in the media browser on WordPress or the media browser in the post/page editor.
The file appears to upload, but stops at the last moment and issues the generic error reading only “HTTP Error” at the top of the media page.
When I disable Cerber, this does not happen.
This problem only arose when I updated from PHP 5.6 to 7.3.