these 2 derivations will be built:
  /nix/store/19rfnb35gwnpfnkvn9vd1i4wqjfpcf0a-black_jack.zip.drv
  /nix/store/0gph8f7dq74zbsk5kwx7ldsy23aqa2ly-ue4demos-black_jack.drv
building '/nix/store/qd8yz3ajf0idpbgsxmlsidg3hzkm431d-black_jack.zip.drv'
black_jack.zip> 
black_jack.zip> trying https://ludios.org/mirror/ue4demos/black_jack.zip
black_jack.zip>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
black_jack.zip>                                  Dload  Upload   Total   Spent    Left  Speed
black_jack.zip> 100 43.6M  100 43.6M    0     0  18.1M      0  0:00:02  0:00:02 --:--:-- 18.1M
building '/nix/store/0gph8f7dq74zbsk5kwx7ldsy23aqa2ly-ue4demos-black_jack.drv'
ue4demos-black_jack> Archive:  /nix/store/xcf03bsj48sknz6s43ln1amfwf7p07s2-black_jack.zip
ue4demos-black_jack>    creating: Black Jack/
ue4demos-black_jack>    creating: Black Jack/BlackJack/
ue4demos-black_jack>    creating: Black Jack/BlackJack/Content/
ue4demos-black_jack>    creating: Black Jack/BlackJack/Content/Paks/
ue4demos-black_jack>   inflating: Black Jack/BlackJack/Content/Paks/BlackJack-LinuxNoEditor.pak  
ue4demos-black_jack>    creating: Black Jack/BlackJack/Saved/
ue4demos-black_jack>    creating: Black Jack/BlackJack/Saved/Config/
ue4demos-black_jack>   inflating: Black Jack/BlackJack/Saved/Config/controller.vdf  
ue4demos-black_jack>    creating: Black Jack/Engine/
ue4demos-black_jack>    creating: Black Jack/Engine/Binaries/
ue4demos-black_jack>    creating: Black Jack/Engine/Binaries/Linux/
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/BlackJack  
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/libicudata.so  
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/libicui18n.so  
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/libicuio.so  
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/libicule.so  
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/libiculx.so  
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/libicutu.so  
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/libicuuc.so  
ue4demos-black_jack>   inflating: Black Jack/Engine/Binaries/Linux/libopenal.so.1  
ue4demos-black_jack>   inflating: Black Jack/Manifest_NonUFSFiles.txt  
ue4demos-black_jack>   inflating: Black Jack/UE4CommandLine.txt  
ue4demos-black_jack> Black Jack

upload niks3: ok