I recently purchased a new phone that uses android 8.0, whilst viewing a video on Facebook the thumbnail is clear and then when the video starts the video becomes very pixelated. The issue only occurs when using Facebook mobile app, the Facebook website streaming is in full hd.
I have tried setting my default preferences to hd when available but doesn't make a difference. My WiFi speed is not an issue neither.
I am starting to think that this could be a app/android settings issue?