Hi rado1877,
welcome to the Apple (user-to-user Community.
Wondering which iOS version you are using on your iPhone XS Max
and
if you have enough memory / storage free on your iPhone for it to operate smoothly
and / or
whether you are using an up-to-date browser to view the photos:
How to use Shared Albums in Photos on your iPhone, iPad, and Mac - Apple Support
says:
"Your photos publish to a website that anyone can see in an up-to-date web browser".
___________________________
If it is an iCloud Shared Library:
How to use iCloud Shared Photo Library - Apple Support
says:
"To join a Shared Library, you need a device with iOS 16.1, iPadOS 16.1, or macOS Ventura or later with iCloud Photos turned on".
All the best :-)