When sharing doesn’t start
What the session page says when your screen can’t be shared, and what usually helps.
Use Chrome or Edge on a laptop or desktop
Course sessions need Chrome or Edge on a laptop or desktop. Safari can’t run the floating panel, and phones and tablets have no screen to share. The panel also needs version 116 or newer.
On a Mac
macOS asks once for screen-recording permission. If your shared screen comes through black, open System Settings → Privacy and Security → Screen Recording, switch on Chrome, then quit Chrome completely and reopen it.
Blocked on a work computer
If no picker appears at all, your browser or your workplace may be blocking screen sharing. A personal computer usually works.
Shared the wrong thing
If you shared a tab or a single window, the session says so. Share again and choose Entire screen.
Write to us
If something here doesn’t match what you see, please write to hello@alongrail.com. A person reads every message.