Watch: Here is How to Request Your Snapchat My Data | Accessing Your Snapchat Data

Here's how you can download every piece of your Snapchat history
snapchat data download
You can access and update some of your data (like your username and Snapcode Selfie) ... Log into your account on accounts.snapchat.com; Click 'My Data'; Click 'Submit Request' at the bottom of the ... You can download this info here.