As I see on my side the problem is in .js
files. They are not uploaded and that gives the error in 100% of attempts. Looks like a restriction in WordPress 6.4.x. Folders without .js files are uploaded with no errors.
As an alternative you can upload files via FTP or use the add-on File Manager advanced to upload files.
Puzzles and JS coding. Fast and expensive.
If you don’t see the meaning in something it primarily means that you just don’t see it but not the absence of the meaning at all.