By now, you might be aware of NPSettings. In-case if its new to you, read this post.
In your Unity project, If Media Library is not enabled, enable by below steps. 1. Open NPSettings and select Application Settings. 2. Under supported features section, Enable Uses Media Library checkbox and Save (see button at bottom).
Once you have Media Library feature enabled, select Media Library Settings. Let us take a brief look into it:
1. Android Settings 1. Youtube API Key : If you want to use Youtube API v3 for playing youtube videos, set this key. Our plugin uses the SDK on filling this key automatically. You can get the API key from here. However, this is optional.