Snapchat etiquette with my ex?

We ended things but decided to remain friends.

He always sends me snapchats, but just general ones because we are on each others best friends list.
I reply to about every 1 in 2 but then he won't respond.

How do we snapchat etiquette? I still want to remain in his life. Should I be replying or ignore them? Should I just send my own general ones back instead? I want to be interesting too!
Snapchat etiquette with my ex?
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