I need help in creating a row level policy

I want to make a row level policy in my bucket

avatars

avatars

to allow users to INSERT and UPDATE a file named

{id}.png

{id}.png

where

{id}

{id}

is their user id.

Example

44451f44-bdc7-43ba-a6c2-f06495c99380.png

44451f44-bdc7-43ba-a6c2-f06495c99380.png

should be able to be updated and inserted by a user with id

44451f44-bdc7-43ba-a6c2-f06495c99380

44451f44-bdc7-43ba-a6c2-f06495c99380