Bridge & your devices · Collab Sync
Why is Collab Sync stuck on “Waiting for … to accept”?
Short answer: The other Mac hasn't granted the request yet. On that Mac, open Collab Sync…, choose where to keep the folder and tap Grant — both Macs must be running Storage Studio and connected. If it was declined, remove it and ask again.
Syncing only starts once the other Mac's owner accepts. On that Mac, open Collab Sync…, find the “… wants to sync a folder with you” request, choose where to keep the folder and tap Grant. Both Macs need to be running Storage Studio and connected for the request to arrive.
If they tapped Decline, the sync won't run; remove it and send a new request when they're ready.