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Server wide
Server. But if content from a community in a different instance has not been fetched yet by anyone in your instance, you need to fetch it first by copying the URL from the original instance into the search box of your instance.
Or just subscribing to the community should work.
Yes, but the first person in the instance to subscribe needs to go the source instance website and manually fetch the community by pasting the URL into the search box. Communities are not automatically discovered cross-instance.
I was asking because some communities were not visible from the “communities” list to subscribe to things
very useful, thank you!