Copy something on any device, open natdrop, paste.
How long should the link live?
Anyone with the link can fetch this one file until it expires, you revoke it (tap its "link" badge twice), or you delete the item.
Downloads
Recorded when a share link is opened (IP as seen by the CDN, so a phone on mobile data shows its carrier) and when you download or share an item from the app. Messenger apps fetch a link once to build their preview; those are counted separately.
Settings
Opens the iCloud link; on an iPhone it lands in the Shortcuts app ready to add. The link carries your posting key: anyone holding it can add items to this feed (never read it), and it can be revoked.
Deletes every unpinned item and its files. Pinned items stay. No undo: it asks for a second tap with the exact count.