Show changes as a notification and not as a blocking modal
The prompt message that shows upon any changes made by the invitees, would be even more helpful if it can be accessed manually at any point of time (or atleast stays there all the time just like "missing fonts" message), which would actually keep us posted on the "changes" status and never miss out them. Also, adding to it, just like someone said in the discussion already - to opt in/out for auto "accept changes".
Please note that by enabling the coediting beta, you will automatically accept others’ changes. Please let us know if this meets your needs!