I've attached a screenshot showing the error. I also get the same error if I just click the "Attach File" button.

I solved this for now by creating a .css file with the following: .UserMenuModal .modal .view { margin-top: 9px; max-width: 300px; min-width: 200px; padding: initial; overflow-y: scroll; max-height: 80vh; } Then, in Safari preferences on the Advanced tab, set this to be the global style sheet. It would affect all sites, but I'm hopeful that there aren't any other sites that happen to use that particular combination of CSS selectors.

More information: export-options.plist: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>destination</key> <string>upload</string> <key>method</key> <string>app-store</string> </dict> </plist> I can upload an archive created with Xcode 15 beta if I use the xcodebuild from Xcode 14.

This appears to be resolved in the Xcode 15 release.