Allow a group name to be used in the "Add contacts" field so that only valid contacts from that group can be used in task assignments, but it can be done very quickly instead of manually entering every email address
Yes! This is the solution I just came here looking for! I need to have all users in a certain group be the only contacts that can be added on a sheet, but uploading them one at a time is way too cumbersome to make this work when forming a new sheet, not to mention adding and deleting users to the group.