Can't drag folders to CopyFiles1 in Build Steps

On PC version you can drag and drop folders into CopyFiles1 in build steps. On Linux, this doesn’t work. Any way to get this working?

I would have created a case for this but the Feedback app doesn’t work on Linux (Ubuntu).

Also, the example app XojoCloudFileManager can’t handle folders either. This would be nice to integrate into the control panel especially if it handled folders.

Can you click the Plus button above?

Yes, I can click plus button. Still doesn’t work.

I just noticed tonight that I can’t even drag files in so something is seriously wrong. I don’t know Linux so there is probably a library I need if you can’t replicate.