It's probably a safe assumption that if you can view files online, they are able to access any of the files. Although there is a database of hashes and whatnot

It's probably a safe assumption that if you can view files online, they are able to access any of the files. Although there is a database of hashes and whatnot for child porn that service providers can access, so they don't necessarily need unencrypted access to the files, since they can hash locally and send that to their servers.