iPhone 13 Pro will not send pictures via text

If you are referring to an actual text or MMS, which is one that contains media, you need to have cellular data turned on, also have MMS turned on in Settings>Messages, and have an SMS/MMS profile on your cellular account. If it still won't work, then contact your cellular carrier and have them check to ensure that you have the correct provisioning for SMS/MMS on your account.

If this is an iMessage, it can be either cellular data or wi-fi to send.