The file could not be uploaded because the destination PATHNAME is invalid

The solution by @Loyarc in #6 did it for me. It would be nice for the module to suggest some options such as temporary:// or public://.

I have used public://sites/default/files/testing with success so I agree that the description for the

Upload location

field could include a couple examples so people don't trip up on this.

Anyone want to create a tiny patch?

I might add a little something for the next release so assigning to me.

I've been slammed with many other things, so unassigning from me.

It's weird because the first time I created a bulk upload configuration (with a simple string like my_folder), I could upload in bulk, then I re-created it or created a new one and I started getting that error during bulk upload.

Using temporary:// revealed another error (with any Form mode selected in the configuration):

No media files have been provided.

but the images are below, unselected, and even if I select them and try to submit, I get the error again.

If in the configuration I leave the Upload location field empty (please note it's not required), the error I get when uploading the files is

The file could not be uploaded.

On a local (DDEV) Drupal 10.4.7, without Dropzone JS submodule.

Duplicate of 🐛 Can not upload using core file upload element (no dropzonejs) because of false validation errors Active (solved there).

Actually this issue can be just about setting a correct path, which can be public://tmp or temporary:// (they should work after fixing the other related issue). To use private:// you must first set the private file path in your settings.php.

Still TODO: improve the help text of the Upload location field

I'm not an expert dev so I'll leave it to others.
(Sorry for the noise).