First, let me ensure what kind of platforms are you going to use to secretly track Snapchat activities? I have a little bit of experience using such types of apps. You can simply use such type of apps which will help you to get updates about your cheating spouse. Beside, you can secretly track your family members as well. Give it a try https://spyx.com/blog/how-can-i-read-my-husbands-text-messages-without-touching-his-phone I hope this will help you a lot.
A Snapchat spy app usually works by accessing the Snapchat account of the target device through installation or remote access. Once installed https://spynger.net/snapchat-spy it can monitor and record messages, photos, and videos sent and received on Snapchat. This includes capturing text messages, media files, timestamps, and sender/recipient information. Some advanced spy apps can even retrieve deleted messages or media.