Missing FBSDKCoreKit.embeddedframework.zip when building iOS target of master branch

Missing FBSDKCoreKit.embeddedframework.zip in “Engine\Source\ThirdParty\Facebook\IOS\FacebookSDK” folder of master and 4.8 branch

Hi Nate,

It seems these libs havent been pushed to github, Ill follow up with our builds team. Thanks for bringing this to our attention.

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