How to slide into DMS... Properly?

So there's this girl I've been working with and we do talk at work but haven't spoken outside of work yet - However, we do get along well together and we recently followed each other on Instagram recently... I've gained some feelers for her but don't want to make it obvious so since we've followed each other on instagram I've just been wondering if there's a way to slide in and start talking to her.

How to slide into DMS... Properly?
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