What
Directory sync keeps a folder on your machine and a cloud session's copy of it in step. When a sync starts with the folder empty, any files that were set aside are now listed in the notification and added to the sync report. Before, that case showed one fixed notice that did not mention set-aside files.
A separate notice about files being uploaded later can also now appear.
Why
In practice, files that sync moved out of the way are named in the notice and the report.
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The exact wording of both notices, and when the later-upload notice appears, is not known.