The Tips section includes more information about the element including FAQs, endpoint limitations, and general tips.
If you do not permanently delete dropbox files, they remain in your Trash folder and generate an UPDATED event type if they are re-created.
Dropbox includes a refId for certain APIs. This is the actual ID of the file sent back from Dropbox. It can be used as the ID with all API calls with the exception of GET /folders/{id}/contents.
The GET /folders/{id}/contents endpoint does not support the refId at this time.