Thanks for reporting. Usually I test something like this with LibreOffice, haven't tested with Browser to be honest.

Same case, when drag & drop it opens the "Insert Section" menu, no idea why

If I can collect any valuable information I'll be happy to contribute

Thanks for checking, I'll try to find some time to investigate this.

Just had a quick local test and for me dragging it LibreOffice Writer works but doesn't work dragging it to GitHub in the browser. I see the temp file is there but permissions seem to be restrictive and only allow the user read and write it.

The permissions seem to make no difference but I've noticed that the browser does, when I open GitHub in Brave (Chromium based) it does not work but it works when I open GitHub in Firefox.

In your case the snap might also be making some problems as it's very restrictive. Could you try, just for testing purpose, the latest AppImage?

Something just came to my mind, on my machine the Brave browser is installed as snap and the others apps that I've used are not. @aseques could it be that in your case the LibreOffice and browsers are also snaps?

@LyzardKing we save the temp file to /tmp, could it be that snaps are not allowed to access this directory?

Yeah, that's it. Just changed the temporary store location to my home directory and I was able to drag and drop the file to by Brave browser.

Yes, snaps have their own /tmp directory, set (I think) with the TMPDIR env variable

But looks like different snaps can't see each others tmp files https://forum.snapcraft.io/t/accessing-tmp-from-snaps/22384/6

Those snaps are just a big headache...

No, the tmp folder is confined as well. There are some workarounds, but mostly require extra permissions.
I think flatpaks may have the same problem, although it is easier to override the confinement.
It might be that the tmp folder for the snap is /tmp/snap.ksnip, but I'm not sure about the permissions on accessing that directory (and it doesn't solve the issue of shared /tmp)

I'm thinking about adding some custom logic to handle tmp files and allow the user to set a custom tmp directory where we will store those files.

Ok, pushed a change that allows now changing the location where temp images are store. In your case with the snap, try to change it to your home directory, after that the drag and drop should be working.

Hi, I was testing the feature and it seems that the dialog is expecting a file instead of a path, if I set the path to a writable location the drag&drop works.

I think I've fixed the directory selection, would be nice if you could test again. I have also added a section to the readme known issues section explaining the issue and the workaround. Closing this issue.

Hi @DamirPorobic sorry I took so long to test, I just downloaded the pre release version and it looks great.