I'm trying to upload a file, but it says that it contains some errors. But it doesn't point out those errors.
Yes, the import isn't good for telling you what's wrong.
Quickly looking at your screenshot I would say the
URL field is causing the issue. It's not a Prismic field, you can see this is the import reference. The
UID is what is used as your
My colleague has pointed out the URL field is probably a Key Text field and not the issue.
They also suggested checking your media imports. You, unfortunately, can't import anything into a Media Link field (other than an image), so this might be the problem.