Just in case anyone is having this issue in iOS and using Bink Video plugin
I got mine fixed because it can’t find the file.
Change the file BinkMoveStreamer.cpp in bool FBinkMovieStreamer::OpenNextMovie() starting in line 253
FString CookPath = *BinkUE4CookOnTheFlyPath(FPaths::ConvertRelativePathToFull(BINKMOVIEPATH), *MoviePathTbl[i]);
ExternalPath = PlatformFile.ConvertToAbsolutePathForExternalAppForRead(*FullMoviePath);
FString SearchPath = ExternalPath;
#if PLATFORM_IOS
SearchPath = CookPath;
#endif
if (FPlatformFileManager::Get().GetPlatformFile().FileExists(*SearchPath))