During SharePoint Saturday in Chicago, I attended a great session by Mark Vogt (https://www.emtecinc.com/) to LIVE BUILD a working PowerApp. Attendees were able to follow along by creating the sample application on their own Office 365 tenant.
The demo video below shows the sample application with PowerApps, MS Flow, and how to leverage the Camera control to take mobile pictures and save to a SharePoint Picture Library. One of the challenges was to convert format from DataURL (PowerApp Camera control) to Binary (SharePoint File).
MS Flow Code