Share Extensions have been disappearing in dev builds in different ways for different versions of iOS 8. (I have not been able to find a clear pattern.) Some people say it is 'only' a problem for dev builds and not for apps downloaded from the App Store. I don't know if that is true since I have not released an app with an extension yet.
In 8.4 (on one of my devices) I was forced to disable/enable my extension every time for it to show up in the share sheet. Now, in 8.4.1, the problem has gotten even worse. My extension does not show up at all. Not even in the 'More' list. So, I am currently not able to test my extension on 8.4.1. And I don't know if/how it will work if I distribute it through the App Store. I've tried TestFlight, and that does not make any difference.
This has been a problem for a long time now but I have not seen any comment from Apple. Maybe I have missed it, but I would really appreciate if someone from Apple could shed some light on this problem.
Thanks!
Claes
