Hello, thank you for your feedback and welcome to the Samsung community. I understand your concerns on wanting to send a Multimedia Message (MMS) and I will be more than happy to help.
The Multimedia Messaging Service lets you send and receive multimedia messages (such as pictures, videos, and audio messages) to and from phones or email addresses. To use this feature you may need to subscribe to your service provider's multimedia message service.
Navigate to and open the Messages app and then tap the compose icon in the lower right-hand corner, or you can tap a previous conversation.
Select your desired recipient
Type out your message
To insert an attachment, tap the Gallery or Camera icons to the left of the text box. You can also tap Add (the plus icon) for additional attachment options.
When you are finished tap Send (the arrow icon)
Here is a link to some additional information on sending messages