Problem sharing your contact photo.
With ios13 the moment you start an iMessage you get a prompt up top to share your photo that you have assigned to your card in the contacts list. This prompt does not stay there until you approve or deny sharing but disappears after a while. If you want to share your contact card photo at a later time , I have not found a way to do so .
How can you share your contact card photo at any time ?
iPhone 11 Pro Max