This app was mentioned in 3 comments, with an average of 1.33 upvotes
https://www.apkmirror.com/apk/oneplus-ltd/oneplus-community/
https://play.google.com/store/apps/details?id=net.oneplus.forums
https://www.apkmirror.com/apk/oneplus-ltd/oneplus-launcher-2/
https://play.google.com/store/apps/details?id=net.oneplus.launcher
https://www.apkmirror.com/apk/oneplus-ltd/oneplus-weather/
https://play.google.com/store/apps/details?id=net.oneplus.weather
https://www.apkmirror.com/apk/oneplus-ltd/oneplus-gallery/
https://play.google.com/store/apps/details?id=com.oneplus.gallery
So is it this Android app?
https://play.google.com/store/apps/details?id=net.oneplus.forums