Why are my photos deleting out of my text messages

Hello jamice33,

The first thing we would suggest would be to power cycle the iPhone by pressing and holding either volume button and the side button until the power-off slider appears. Drag the slider and wait 30 seconds for the device to turn off. While simple, this can refresh the iOS, apps and connections. More information is available here:  Restart your iPhone - Apple Support

If the photos are still missing, do you have Messages in iCloud enabled? Tap on Settings > [your name] > iCloud and see if Messages is toggled on.

If it is, are the pictures missing on other devices also?

Is this happening in all conversations, or only certain ones?

This information will possibly allow others to provide suggestions for a resolution.

Have a good day.