virtual [TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FUserFileWriteFile](API\Plugins\OnlineServicesInterface\Online\FUserFileWriteFile) > WriteFile ( [FUserFileWriteFile::Params](API\Plugins\OnlineServicesInterface\Online\FUserFileWriteFile\Params) && Params )