This may possibly help -
I landed on this page after searching about issues with WU not displaying my uploaded webcam images (as reported elsewhere, I was just seeing a spinning circle when trying to view my webcam images).
I could tell that my FTP uploads were working OK, the image was correctly named and within size limits, it just wasn't showing on WU.
I went into 'Manage devices' on WU, and added a 'Device Name' for the camera (this is separate from the 'ID' which the camera has of course had - I don't think it ever had a name previously, just the ID.)
As soon as I'd saved that, I was able to view the uploaded images (as composited videos), not only the latest, but all the others that had been uploaded for prior times / dates.
It used to be possible to see 'noon photos' in a calendar layout, but I can no longer spot that page (I may just be missing a trick of course)
One 'gotcha' - I noticed that after making this change, my new images weren't being uploaded, and were failing with an FTP authentication error.
The 'Manage devices' page for the camera does show a key, and by using that key as the new FTP password, the uploads started again.
So if you're having issues either with the FTP uploads, or being able to retrieve camera data that you think has been uploaded, it might be worth checking that your camera has a device name as well as an ID, and that you're using the key shown in its config as the FTP password.