Flatpak Thunderbird – How to fix attachments not working (Steam Deck Desktop Mode)
by techie.g33k on Sep.29, 2022, under Linux, Techie
If you want to get Thunderbird on Steam Deck (Desktop Mode) to allow attachments then you need to run the following from Konsole:
sudo flatpak override org.mozilla.Thunderbird --filesystem=home
NOTE: You still can not use the Attach buttons or CTRL+SHIFT+A options, but click-and-drag works fine.