So you're saying that when you open the Google Photos app, tap Menu>Device Folders and select Download, you see the photos there? If so, then as I mentioned before, those photos won't show up in your main Photos feed unless you have the Download folder set to backup automatically. In the Device Folders screen, look for the cloud icon associated with the Download folder, and tap it to toggle backup on for that folder. Keep in mind, though, that this means any image you download to the phone will automatically get backed up to your Google Photos. You can always put those images in the trash, but it could become a hassle.