Pictures and movies do not play

Question:

Pictures and movies do not play on my iPad, but they do on the other iPads.

Answer:

With a combination of iOS11 and A10 Fusion chip or above, the format of a picture and a movie will be HEIC or HEVC when you took them using the native camera.

The following setting could prevent the error.
1. Go to Settings -> Camera -> Formats
2. Select "Most Compatible"
3. Take pictures and videos again

Note: This does not happen when you used a camera inside the app (LoiLoNote School)