commit update process started with StartItemUpdate()
public static SteamAPICall_t SubmitItemUpdate(UGCUpdateHandle_t handle, string pchChangeNote) { InteropHelp.TestIfAvailableGameServer(); using (var pchChangeNote2 = new InteropHelp.UTF8StringHandle(pchChangeNote)) { return (SteamAPICall_t)NativeMethods.ISteamGameServerUGC_SubmitItemUpdate(handle, pchChangeNote2); } }