Known issues

docs/known-issues.md

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+# Known issues
+This is an incomplete list of known issues with the ntfy server, Android app, and iOS app. You can find a complete
+list [on GitHub](https://github.com/binwiederhier/ntfy/labels/%F0%9F%AA%B2%20bug), but I thought it may be helpful
+to have the prominent ones here to link to.
+
+## iOS app not refreshing (see [#267](https://github.com/binwiederhier/ntfy/issues/267))
+For some (many?) users, the iOS app is not refreshing the view when new notifications come in. Until you manually
+swipe down, you do not see the newly arrived messages, even though the popup appeared before.
+
+This is caused by some weirdness between the Notification Service Extension (NSE), SwiftUI and Core Data. I am entirely
+clueless on how to fix it, sadly, as it is ephemeral and now clear to me what is causing it.
+
+Please send experienced iOS developers my way to help me figure this out.
+
+## iOS app not receiving notifications (anymore)
+If notifications do not show up at all anymore, there are a few causes for it (that I know of):
+
+**Firebase+APNS are being weird and buggy**:    
+If this is the case, usually it helps to **remove the topic/subscription and re-add it**. That will force Firebase to 
+re-subscribe to the Firebase topic.
+
+**Self-hosted only: No `upstream-base-url` set, or `base-url` mismatch**:   
+To make self-hosted servers work with the iOS
+app, I had to do some horrible things (see [iOS instant notifications](config.md#ios-instant-notifications) for details).
+Be sure that in your selfhosted server:
+
+* Set `upstream-base-url: "https://ntfy.sh"` (**not your own hostname!**)
+* Ensure that the URL you set in `base-url` **matches exactly** what you set the Default Server in iOS to