We solved the error handling client side (Snapcraft) with a channel map query to the Snap Store before trying to set the track. What is missing from the Snap Store is being able to set "latest" as the default.
We solved the error handling client side (Snapcraft) with a channel map query to the Snap Store before trying to set the track. What is missing from the Snap Store is being able to set "latest" as the default.