How to store selections from CheckBoxGroup widget in a Firestore document

Hi all,

I am perplexed by this and would really appreciate your help.

I simply need to save up to 5 selections from the CheckBoxGroup widget to an array of strings located in the Users collection.

A bit more detail:

Selections should only be saved to the field in the "Users" collection when the user hits a "confirm" button.

Can someone kindly provide a set of step by step instructions on how to achieve this? I would be most grateful! ๐Ÿ‘

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