FYI: This issue appears to have been resolved on Xcode 27.2 using a simulator running iPadOS 27.2. The issue still persists on the 27.0 iPadOS simulators. Dull, but true. (But dull.)

So… the files are correctly copied, it’s just thar you need to use the full URL to access them, rather than simply being able to use the standard named: approach.

Weirdly the issue appears to go away when you’re logged into an Apple ID. Which of course makes complete sense. 🤔