You can capture photos and videos directly in the Messages app. You can also modify the photos and videos before you send them by editing the image, marking it up, or adding effects.
Note: Your carrier may set size limits for attachments; iPhone may compress photo and video attachments when necessary.
Take a video: Tap to send the photo or video without adding a message.)
Note: To send SMS, MMS, or RCS attachments on use the photo editing tools to change the photo, then tap Done.
Add a comment (optional), then tap Draw and handwrite messages on iPhone