Subscribe to items dropped onto this app by a host-mediated cross-app drag. Returns an unsubscribe fn. Subscribing is the opt-in: an app that never subscribes receives nothing (the host shows a "not accepted" cue and the drop is a no-op).
Subscribe to items dropped onto this app by a host-mediated cross-app drag. Returns an unsubscribe fn. Subscribing is the opt-in: an app that never subscribes receives nothing (the host shows a "not accepted" cue and the drop is a no-op).