Caption and comments are different
The card already has “link in bio”. That is the caption; you do not collect it as comments. “Where is the link” lives below, in the paid list.
The payment boundary
The caption is visible before comments are collected. The comments themselves are a separate list. Mixing the two means waiting for leads where they are not.
Frequently asked questions
Does the caption go into Excel?
Comments yes, as rows. The caption stays on the post card.