Delivery
Sized, sharpened, marked.
A watermark is a saved thing you pick, not a set of fields you retype. Sharpening is chosen at delivery, because the right amount depends on the size you are sending.
Build the mark once. In Settings → Delivery → Watermarks, choose Add watermark, name it, pick the image, and set where it sits on a nine-position grid with an opacity and a size. Size is a percentage of the delivered photo’s long edge measured after any resize, so one mark reads the same on a 1200-pixel wire file and a full-size gallery file. Corners sit slightly in from the edge rather than hard against it.
A PNG with transparency composites cleanly. A JPEG works, but its whole rectangle prints, white corners and all.
Then pick it per send. The watermark dropdown appears on export to a folder, on export to ZIP, and on Send to FTP, and each FTP destination can carry one as its default. It is a picker rather than a switch on purpose: you watermark for where the picture is going, so social gets the logo and the wire does not, whatever the destination usually does.
Deleting a watermark tells you how many FTP destinations were using it. They keep sending, without a mark. The image file on your disk is not touched.
Output sharpening has four settings. Off leaves the pixels exactly as resized. Low is gentle, for screen and social. Standard is a typical delivery JPEG. High is for print or a heavy downsize.
The amount scales with the size you are actually sending, which is why this is a delivery choice rather than an edit. It is applied after the resize and before any watermark, so a composited logo is never sharpened along with the photo, and the Edit tab never shows it.
Per send, or per destination
Where sharpening is chosen
On Export, Export to ZIP and Send to FTP, and saved on each FTP destination as its default. When a send differs from the destination’s saved level, the panel marks it (this send only) so you can see you are off the usual setting.
One thing that does not apply
Copy to Folder is a copy
Copy to Folder never converts, never resizes, never sharpens and never watermarks. It is the route for moving the original file, and the absence is deliberate. Use Export when you want a rendered copy.
A sharpened file is re-encoded as a JPEG. Anything the app cannot render will fail the send rather than go out unsharpened, which is the safer of the two failures: you find out, instead of the client receiving something soft.