The service is pretty straightforward: photos and videos are sent directly to iCloud, so there’s no need to download anything. You can send your whole library at once or specify which albums you want transferred. Google has a list on its support page of the file types you can transfer, which includes common image and video formats. And .webp, for some reason. Initiating a transfer sends a copy of each file to your iCloud account, so the originals will remain in Google Photos unless you…