@leocg
All tests with MS Edge 114.0.1823.82
Testupload of image from "L:\Name1 Name2\Bugs\Opera\Missing bookmark name\2023-07-19_07-11-41.jpg" (fails)
""
Upload from "L:\Name1 Name2\2023-07-19_07-11-41.jpg" (ok)

Upload from "L:\Name1 Name2\Bugs\Opera\MBN\2023-07-19_07-11-41.jpg" (ok).

Upload from "L:\Name1 Name2\Bugs\Opera\Missing bookmark\2023-07-19_07-11-41.jpg" (ok)

It looks like multiple spaces inside a path part "Missing bookmark name" is the reason why it fails.
I hope this helps.