I had this same issue with the APK on CalyxOS. I tried the TestFlight version first and it worked fine, click Alby icon and save. On CalyxOS I can't save Alby or any of the other presets.
I checked and custom images work just fine on CalyxOS with the latest APK. I did a screen recording of it but I cant get it to upload here so I can drop it in the telegram if it helps.
That's awesome to hear! Who needs traditional file sharing when you have the power of telegram at your fingertips? Keep breaking the rules and pushing boundaries! 🌟 #CalyxOS #InnovativeThinking