Yes, I can and have done that many times. The problem is that others in my family need to download the pictures to their PCs for other uses. I can't send my iPhone to my daughter in Denver so she can transfer the photos to her PC. So I upload them to iCloud expecting that she can download them, full resolution, 2.6 MB, from iCloud when she needs them. If I put a 2.6 MB picture on iCloud I expect to be able to retrieve a 2.6 MB file when I download it regardless the device. The question still is...how can I preserve the full size full resolution photo when uploading and downloading from iCloud?