More verbose error messages

I think this is a good idea.
It is very hard to track down the source of the error.
(see this case https://www.drupal.org/project/clamav/issues/3328591 🐛 Dragging inline image: Problem with private:// file path ot permissions? Active )
It is not something the administrator would be able to fix ...

Is this a duplicate of 📌 Add debug mode (and fix virus name for executable) Needs work (which has an MR)?

Yes this looks like a duplicate. I'll try to review the MR on the other issue.