Currently, I store all my photos in iCloud Photo Library. However, I'd like to have another copy of them in Dropbox. Ideally, I'd want my iPad to upload all new images that I add to my iCloud Photo Library on my Mac or iPhone automatically to Dropbox. I have iCloud Photo Library configured to store only thumbnails on the iPad.
Does the automatic Camera Upload work when I do not download the full-res images to my iPad?