The feature enables creators with 50 or more subscribers to invite a guest to livestream with them. Only one guest can be hosted at any given time, however, guests can be rotated during the same livestream and do not share the same 50 subscriber requirement to co-stream — any YouTube creator can be invited to collaborate.
The feature is currently limited to the YouTube mobile app and is not available to desktop users. Creators can schedule a co-stream through YouTube on desktop, but both…