Regarding Proton Pass on macOS, you can use the browser extension and the web app on any macOS device, and the desktop app for macOS will soon be available too (now in closed beta). Silicon chipsets should be able to use the iOS Proton Pass app as well.
You can easily view photos on Proton Drive now. You can also use the Proton Android app for photo backup (on iOS this functionality is in beta as the moment).
Finally, you can share the domain with a family member - the Proton Family plan supports both custom domain addresses for sub-users as well as existing Proton Mail addresses.
If you're having any issues using any of the services, please contact us at: https://proton.me/support/troubleshooting?product=account, and we'll make sure to look into each of the issues closely. Thanks in advance!