On the Sample screen,
- Select the sample that you wish to add a photo to (samples for the zone are listed in the lower left). Three icons appear.
- Tap the camera icon. If this is the first time that you have done this, the app will give you a couple of permission prompts. You must allow the app to access the camera to take a photo.
- Take the photo, then tap "Use Photo"
The photo is now attached to the sample. Note that once a photo has been attached, there is no way to view it or remove it in the app (although this behavior will be changed in a future version). To change the photo to a different one for the sample, just repeat the above steps.