You can remove individual or multiple photos from your My Photos section on your Android device.
To access your my photos section, tap your inbox.
Tap a chat you would like to work within.
Your photo gallery can be found by tapping on the Camera Icon.
When you're in the My Photos section - tap and hold on the first photo and once that is selected, you can select more photos.
NOTE: Grindr Free users will only be able to select one photo at a time. Grindr Xtra users can select and send/delete multiple photos.