Set the closest field input value to the selected file URL

admin.js

// select handler
var on_file_select = function ( $button ) {
    return function () {
        // fetch selected file
        selected_file_url = file_frame.state().get( 'selection' ).first().toJSON().url;

        // set linked field input new value
        $button.closest( '.acf-input' ).find( '.acf-url input[type=url]' ).val( selected_file_url ).trigger( 'change' );
    };
};