I have 2 boards - one project based with members and on that is 'private' todo lists with only me as admin / member. Can I invite a member from the other board to be able to view / interact with a specific card on my personal board without them viewing all my other cards? (At the moment I cannot see any invitees in the add member box within the card)
Yep, I've built another board and added the people I want to have access to those cards onto it, then created a Butler rule to mirror cards across boards when I add a label such as
Shared, where it creates a two-way link between the cards.
However, I haven't figured out a way to make the changes two way. meaning If a comment is made on the shared board, it also gets reflected on the personal one.