docs: collect how-to records what OneDrive on Windows does to a phone upload (online-only placeholder, original times kept, so settle_seconds does not hold it back), export how-to says a tenant found and used the .md files (#213 E3, #214 F1)

Files changed:
- docs/how-to/collect-from-a-synced-folder.md
- docs/how-to/export-to-a-synced-folder.md

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

docs/how-to/collect-from-a-synced-folder.md

@@ -84,6 +84,13 @@ a client that pauses for longer than the interval in the middle of a file and th
 file is stored incomplete, and the review is where you notice it. Raise the value if your client
 works over a slow link.
 
+OneDrive on Windows, checked with 10.0.0: a file uploaded from a phone shows up in the folder as an
+online-only placeholder (attributes `Archive, ReparsePoint`) that keeps its original creation and
+modification times - a week old in the check, not the time it arrived. So `settle_seconds` does not
+hold such a file back; reading it, which `collect` does, downloads it, and the size-and-sha256
+check is what guards the copy. The copy in the quarantine carries the time of the collect, not the
+original one.
+
 ## Deleting in a synced folder deletes everywhere
 
 A file removed from a folder that OneDrive syncs is removed on every device that syncs it. That is