You can use Anvl's Messages feature to contact your supervisors by raising a flag. Once your flag has been responded to, you can send videos, photos, files, and text to follow-up on questions.
In Anvl's mobile app you can find your messages by going to the Messages tab on the bottom (portrait) or side (landscape) of your screen.
Within the Messages inbox, you can see all your messages Click on a message in your inbox to respond. You can send photos, videos, and text via Messages.