I have the same Jami account set up on two devices, an iPhone running iOS 14.4 & Jami version 3.12 (20210311) Together and an Android running 10 & Jami version 20210226-01 (from F-droid).
I was aware outgoing messages wouldn’t sync but recently realised not all incoming messages are synced on both devices, so parts of incoming conversations were missing. I’ve scanned the forum but haven’t seen this reported elsewhere.
I’m getting answers only on my Android app, not on my laptop (Ubuntu 20.04), even when I use the laptop to send. When changing the status on my Android phone to off line, the messages don’t arrive at all anymore.
On “Together” built on 2021-04-08 18:04:58 UTC
It looks like there must be an other factor in the game then the OS Jami is running on.