Unable to pack file

This error comes up every time:

47CCCDF5-2BE2-4A1F-8283-0313F1FB5766_4_5005_c

Fine. I check where the file is to verify it’s there. It’s there. I copy and paste it over itself just to reaffirm that it’s there.

I’ve changed the path to absolute - same problem. I’ve changed the path to relative - same problem.

I’ve checked the automatically pack file - same problem.

Been there ever since 2.9x.

Months now.

Every possible solution I could find or think of, I’ve tried.

Still a problem.

What am I missing? What else might I try?

I add it manually before render - that works.