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I resolved this final issue by ensuring that I had a folder (/Users/nikolay/Desktop/projects/cling_wrap/assets/icon.iconset) which contained the following 2 files: icon_512x512.png (with a resolution of 512pixels by 512pixels, obviously) icon_512x512@2x.png (with a resolution of 1024pixels by 1024 pixels) Then I used the following command to regenerate the icon.icns file: iconutil --convert icns assets/icon.iconset With this, Transporter accepted the app and was able to upload it:

I was able to execute productbuild using a different certificate, namely the 3rd party developer certificate. Also, I watched a video on Notarization, and it says the notarization is only for apps distributed outside the app store? https://developer.apple.com/videos/play/wwdc2021/10261/ Is this true? So this means that I do not need to notarize or staple my app if I am uploading it to the App store directly? I attempted to follow this assumption and skipped notorization altogether, opting to simply run the following productbuild command and then use Transporter: productbuild \ --version '0.0.1' \ --sign "3rd Party Mac Developer Installer: Nikolay **** (Z57YJ*****)" \ --component '/Users/nikolay/Desktop/projects/cling_wrap/dist/testapp.app' \ /Applications testapp.pkg I'm now just stuck on this one error: