UX: Uploading Images (when invalid, display error message, not a hover): How to incorporate nicely?

UX: Uploading Images (when invalid, display error message, not a hover):
How to incorporate nicely?

the upload process is currently set up as is:
If you upload an invalid image (maybe too large of a resolution, maybe
file size too big, maybe invalid image type, maybe invalid filename
format) it currently displays an X in the 'VALID' column.
You can then hover over this X and the error message will display. Sure,
this isn't horrible, but we would like to have it so the error message
displays within the popup, so the users can copy/paste the error message
(this is their request).
See image:

You can upload either a single image or multiple ones, and some may be
uploaded successfully, others may not be. So of course we don't want the
popup to be just a absolute mess of text and whatnot.
Any input on the matter is appreciated.