Trying to view a video in a report but all you are seeing is a blank black square? Don't worry, it's there but you may just not be able to view it. Why not? Well, it's something to do with the compression standard used (what's called a video codec).
Most Shepherds will use phones that compress video using the codec H.264 which is widely supported by all modern browsers. Some Shepherds will use newer phones (iPhone X for instance) that use a newer codec called HEVC (High Efficiency Video Coding) and tends to be referred to as H.265.
So how can you check if you can view it? As you will be viewing reports using your desktop or mobile phone browser (Chrome. Safari, Firefox, IE) you will need to ensure you view it using a browser that supports the format. It's as simple as that.
To see what browsers support it, please visit this handy website.