Application Loader: “Cannot proceed with delivery: an existing transporter instance is currently uploading this package”
Basically, you need to clear out the transport tokens. This can happen if you were to close out of Xcode while in the middle of submitting an app to iTunes Connect. The token files now appear in the Library/Caches/com.apple.amp.itmstransporter/UploadTokens/ subfolder of the given user’s home directory. Which, honestly, is a better place for them anyway. … Read more