By default, Amazon blocks installations from "Unknown Sources." You must turn this off.
You have two options: ExoPlayer (built-in) or VLC.
The safest way to sideload 1 Pix Media is using an app called "Downloader."
Select (or "Apps from Unknown Sources") and turn it ON . 2. Install the Downloader App
In Settings > Preferences > Privacy Settings , it is recommended to turn off "Device Usage Data" and "Collect App Usage Data" to improve performance. Step 1: Install the Downloader App If you don't already have it: