Unfortunately, when our users are linking their lists to Canvas, it has not resonated that they are only seeing a PREVIEW of their list, and need to click SAVE to actually link it.
When they see the correct preview, they think it is already linking correctly and that they don't need to do anything further.
It needs to be much clearer that they need to click Save.
Please add a warning bar at the top of the preview to notify users, with the Save button located to the right within it.
This design would be consistent with the 'Unpublished changes' warning bar at the top of lists.