[FREE] AdColony, AppLovin, Chartboost, UnityAds, Vungle, Sharing, OneSignal, Facebook, Everyplay

Community Community & Industry Discussion
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Check this two threads and try with a new project after you make the changing in the sharing plugin and the required file

and

https://forums.unrealengine.com/development-discussion/c-gameplay-programming/118722-c-4-16-transition-guide