Signal update or not update ? App as system app

[Markus]

System apps should not be updated from external sources like F-Droid.
You can find additional reasoning in this post:

App updates with signal

The system apps …the applications that are installed along with the /e/ ROM are all tested for their ability to work together. Updating an app from that group separately may upset this ‘balance’. That may be the reason why the notifications are failing. Ideally this should not happen and moving ahead once we have the /e/ app store and installer integrated this issue should not come up.