Okay, everyone, I installed the current update and the app no longer crashes 🥳 but now I don’t know how to import my Signal data from within the same phone (the local export/import doesn’t really work and doesn’t include messages)

In my experience, yes. Can only speak for myself and my device though

Shorter password and even just letters (yikes) doesn’t work either

Just installed the FOSS version, was greeted with a “you can encrypt your database with a passphrase” message, put a long password in both fields, and, well, app crashes. Not really trustworthy imo