Read over https://www.google.com/search?client=firefox-b-1&q=why+can't+i+record+more+than+10+seconds+on+snapchat
Nothing seems wrong here. Get to Snapchat support to check if your version does more.
I have an IPhone X and when I record it stops at 10-11 seconds almost every time. Rarely does it go on longer. Anyone know what my problem is?