Open the chat with the person you want to message
Tap the photo or camera icon in the chat
Select the photo you want to send or take a new one
Look for the option to set the photo as expiring or view once
Choose the expiration or view limit if available
Send the photo
If the option is not shown, update Grindr to the latest version
Check whether expiring photos are available in your region or account
Make sure photo permissions are enabled for Grindr in your device settings