Trouble making build in iOS

So I’m trying to build my Unity Game to iOS. And I’m running into serious problems, involving integrating Google Play into the build. These are one of the tutorials I’m following:

But I’m still bumping into the same error I’ve been getting for over a day:

‘GIDSignIn.h’ file not found

GPGSAppController.mm

I have no idea where to look or how to fix it. Am I the only one who thinks making a iOS build in Unity is ridiculously complicated? Please help!

It’s not complicated. You build in Unity then open the generated project in Xcode and build. But yes, it can get tricky if there are issues.

Have you tried getting support from Google?