OPPO Reno 5G
It's not possible to send and receive picture messages
Solution 4 of 5: The picture message isn't written correctly
A picture message is a message which can contain pictures and other media files and can be sent to other mobile phones. If you can't send and receive picture messages as soon as you've inserted your SIM, you need to set up your phone for picture messaging.
Press the message icon.
Press the new message icon.
Press the search field and key in the first letters of the recipient's name.
Press the required contact.
Press the text input field and write the text for your SMS.
Press the attachment icon.
Press Picture and go to the required folder.
Press the required picture.
Press the send icon when you've finished your MMS.
Press the Home key to return to the home screen.