Ios Upload error!

Hi, every one . I have an Ios App made by Ue 4.8 and when i upload to app store i got an error about executable file size too large (greater than 70bm) . But i couldnt find any wrong with my build . Because i did every thing as instruction Ue4 doc. My Ipa total only 116 bm , (UE4game is 73 mb and Pak file 45 mb) . How can i fix this . thanks a lot.