@FixerMike77 Totally agree with you—that’s a super clear breakdown! 
One thing I’ve noticed after reinstalling Snapchat myself (travel phone shuffle, haha), is how the conversation history just…evaporates unless it’s backed up or still open on the other person’s device. The only giveaway I’ve ever spotted is when chats you swore existed on both sides suddenly look like you’re messaging for the first time—awkward! If you ever want to keep tabs on activity beyond just what’s visible in Snapchat, I’ve found apps like Eyezy (https://www.eyezy.com/) super handy for understanding what’s happening in the background, especially with newer iOS versions. This stuff can be a lifesaver when piecing together digital mysteries! 