After uploading the app archive generated by Xcode (which passed validation), I received an email stating one or more files had the com.apple.quarantine extended file attribute and to remove the attribute before uploading the archive again. A particular PNG file was identified. In the terminal, I ran the command: xattr -d com.apple.quarantine The response was: "No such xattr: com.apple.quarantine" I also ran "xattr -rd" on the directory containing all app files. No response. The identifed PNG file at fault is a screenshot used only in the app's User Guide. It was created 5 years ago using Apple software: Ctrl-Shift-4 to capture the image, Preview to resize. Given the file does not have the quarantine extended attribute, I can only conclude that Xcode is adding the attribute when building the archive. How do I stop Xcode from adding the attribute? I have search Google with numerous search criteria and check the Apple Developer Forum, but could only find how to remove the attribute using xattr; nothing about Xcode adding the attribute when building an archive.