I’m trying to figure this out as well. My Messages extension is bundled with my main app and shows up when the More button is pressed.
This developer doc seems to suggest all I need to do is add a new Info.plist entry to appear in the Stickers context.
I added…
MSSupportedPresentationContexts
- MSMessagesAppPresentationContextMessages
- MSMessagesAppPresentationContextMedia
However, the extension still only appears in the Messages app and not in the keyboard based Stickers app.
I’m using a MSMessagesAppViewController
but I think that’s fine.
If I figure it out I’ll let you know.