Offline save games don't work on Apple TV, (in fact all file operations fail) because Apple has decided that you can't store anything in the NSDocumentDirectory anymore. The fix is to replace occurrences of NSDocumentDirectory with NSCachesDirectory for Apple TV in IOSPlatformFile.cpp

Steps to Reproduce

Offline saved games are not supported on AppleTV, licensees fix is not reliable because the caches folder the licensee suggests we save to can be deleted at any time by the OS. 

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Won't Fix
ComponentPlatform - Mobile
Affects Versions4.224.23
Target Fix4.24
CreatedJul 31, 2019
ResolvedOct 28, 2019
UpdatedSep 8, 2020