Note that i want to empty cart field from all of products by sending one PUT request to /api/users/{user_id} endpoint.
But your “video example” is about add and remove product one by one (individually) to cart (which works fine). As i mentioned above, i can add and remove product (individually) to cart by sending to /api/products/{product_id} endpoint.
In another word, i want to update relations of User Content-Type (users-permissions) by sending PUT request to /api/users/{user_id} endpoint. Please take a look again to endpoints of images in my above question (from second image).
My strapi CMS permissions:
P.S: I also update my strapi CMS to v4.19.1 but didn’t worked.