Why can I use background delivery to realize background notifications when I run the app for the first time, but when I delete the app running in the background, and then reopen the app to run it in the background, there will be no background notification when the data changes?
By "delete the app running in the background," did you mean that you forced quit your app by removing it from the multitasking UI (using the swipe-up gesture)? If yes, what you see will be an as-designed behavior, as mentioned in this thread.
Best,
——
Ziqiao Chen
Worldwide Developer Relations.