I want users to make a collection of data, after creating a collection, then I want to map this collection so that whenever users upload data> user have a choice:

1. create a new collection and place an image on this collection (done)
2. Map existing collection from firestore (stuck on this)
3. in the future I made a button-based on that map in point 2, then add a data to the existing collection

structure data that I want to achieve

1. users > userID1 > hobby
2. users > userID1 > job
3. users > userID1 > relation

map collection under userID1