I know a lot of people are recommending fstsb entries, but since you’re using a DE, you can have the credential stored in the wallet / session manager for your DE. KDE and Gnome should both have an automount option using keys from there. Then you also can find a preference somewhere to unlock your wallet / session keys thing on login. Bing bang boom you should have it mount and unlock automatically without having to enter any extra stuff with the added benefit of not leaving the key around (though since it seems you have FDE anyway that’s a minor issue depending on your threat model)

Reminds me of this app I’ve never used but seen that uses audio to transmit images with something called SSTV:

SSTV Encoder (Image encoder for Slow-Scan Television (SSTV) audio signals) https://f-droid.org/packages/om.sstvencoder/

(And also Robot36, I think one encodes and one decodes)

Gemini is so weird and cool! My first day with it really made me want to start a little microblog on it or something

Fongo World seems to be a weird but working option for me.