Recommended and mentioned products
Secure File Storage and collaboration
Photo storage simplified
Yogile has been built with shared albums in mind and doesn't touch your photos other than for rescaling.  https://yogile.com.
Photo organization and protection, using peer-to-peer to keep all your photos available an all your...
I like Mylio - it's local only but syncs p2p style across local network. Or obviously you can sync folders with Whatever Online Service you choose, Mega or whatever. https://mylio.com.
Encrypted cloud storage for your confidential files. Using Tresorit, files are encrypted before being uploaded to the cloud. Start encrypting files for free.
I similarly use Tresorit (https://tresorit.com/) and share photo albums but these are general cloud storage as opposed to being optimized for viewing photos in a browser.