A quick housekeeping note: Iāve moved this to a new topic since the original topic is quite a bit old and replies on it alert all of the previous participants.
Iām led to believe the answer is ānoā based on a bit of poking around on the Trello web client. Unless Iām missing something, using the Trello web client, you canāt create a card with a coverāyou can only add a cover after the card is created.