To add a timestamp to a photo that has been taken or uploaded to a form, this will need to be enabled in the Form Template itself through the Web Portal first.
To add Time-stamping to a photo field through the Form Builder > Select a Photo Field / Add a new Photo Field > Select Timestamp from the Photo Tag Options in the Field Settings > Deploy / Publish Template to save changes.
When taking a photo through the App the Timestamp will show the exact time the photo was taken and will be watermarked on the photo.
If a photo has been imported form your devices photo gallery, the timestamp will show the date and time this was imported into the form.
When a CRM field has been used in the same form, these photos will save under Photos in the CRM for that specific contact.