I just learned about Thunderbird Mobile for Android and installed it from F-droid. Everything seemed to go okay until I tried to import my settings from the desktop (Thunderbird 128.7.0esr (64-bit) running on SolydK Linux 12 (Debian Bookworm)). I lined up the QR code (I think) and pressed the Done button, but it just dumped me back to the Getting Started screen without accessing my settings at all.