Error during tests

Good evening everybody.
I'm still struggling with "Unable validate Firestore Schema". ChatGpt said that "Make sure that the field created_by in the user document contains the user's UID and that you're correctly passing the user's UID when creating or writing data to the users collection." - my Firestore is having UID within a schema but how to find out if I correctly passing the user's UID when creating or writing data to the users collection?
There are screenshots of the developer menu, Firebase storage rules too.
I'm a noob in backend development so please if you know how to solve the error - help me and describe it step-by-step..
Thanks in advance

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