How to Auto-upload Screenshots of Android to Google Photos or Other? I just noticed that my phone is not automatically uploading screenshots into Google Photos. 

Phone: Oneplus 2
OS: OxygenOS 3.1 (Android 6.x)   

Phone: Oneplus 3T
OS: Oreo 8.0
Auto-upload of Screenshots is not a standard feature in Android 6.x at the moment. (beeshyams)