[Linux/Flatpak] Drag-n-Drop and File paste only work for files from the home directory

[ShGKme]

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Flatpak distribution only supports file transferring (drag-n-drop and paste) from the home directory.

Steps to reproduce

1. Using Flatpak distribution
2. Try to drag a file from not a home directory and send it

Expected behaviour

It works.

Actual behaviour

The file has 0b size.

Additional info

Use case: Spectacle on KDE (screenshot tool) saves screenshots to /tmp

[ShGKme]

Workaround:

flatpak override --user --filesystem=/tmp:ro com.nextcloud.talk