"+" waits for its own add's answer rather than only the first send's,
so a page added behind other work still opens; with no answer in five
seconds it says the page will appear once it reaches the cloud. Edits to
the copied page the server refused are named, since they aren't in the
copy. Images left out are counted, not matched by id, as a copy of an
item with a long id gets a plain one. Switching strategies mid-add stops
it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>