issue: cannot drag files into application; they appear as 0 kB files

Not sure if changes need to be made upstream at revoltchat/desktop to allow this to work.

Start by reproducing the drag-and-drop behavior in the Revolt Desktop application and determine whether the issue belongs in this Flatpak repository or upstream at revoltchat/desktop. Compare the displayed file size with the original file and document which repository and entry point need the change; done means dragged files appear with their correct size and can be used normally.

Written by the indexing model from the issue text.