I created three test labels, "R&C", "R & C", and "&" with the "Create new label" option in the Gmail sidebar. They appeared as "R+C", "R + C", and "+" in Postler.
I created three test labels, "R&C", "R & C", and "&" with the "Create new label" option in the Gmail sidebar. They appeared as "R+C", "R + C", and "+" in Postler.