Thnak you for you quick reply.
The problem occurred in a 3 years old project after updating to macOS 26.2 (25C56) and Xcode Version 26.2 (17C52).
I've created a new project : same error! All files synchronize except the .xcodeproj file.
There is 19GB free on iCloud Drive, and 59GB free on the Mac.
If I open the original .xcodeproj package file, copy all the included files in a folder outside, then they all synchronize on iCloud Drive except project.xcworkspace
Here are the attributes of this file
com.apple.FinderInfo 32
com.apple.fileprovider.fpfs#P 4
com.apple.lastuseddate#PS 16
com.apple.macl 72
It's also a package, but the time if copied outside all its file are correctly synchronized to iCloud.
A feedback had been opened : FB21363976.
It includes a zip with the file not syncing.
Thank you.
Topic:
Developer Tools & Services
SubTopic:
Xcode
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