Actually it's not a solved issue. I do not have 1000 images in my library and I have been running into this issue regularly. So for everyone else who is pulling their hair out as I am, the issue still exists for less than 1000 images in a library.
Can you provide steps which encounter the issue.
I have this same issue. Why I try to save an asset on Adobe Stock into my library I get the error message:
Unable to save asset to "library name here".
No explanation about why or how to solve it. Help!
There are some things that may cause this.