Show only user loaded images in ACF Gallery in frontend using acf_form | And grant user permission to upload files and change published page

functions.php

<?php
$role = new WP_User( $userID );
$role->add_cap('upload_files', true);
$role->add_cap('edit_published_pages', true);


add_filter( 'posts_where', 'devplus_attachments_wpquery_where' );
function devplus_attachments_wpquery_where( $where ){
	global $current_user;

	if( is_user_logged_in() ){
		// we spreken over een ingelogde user
		if( isset( $_POST['action'] ) ){
			// library query
			if( $_POST['action'] == 'query-attachments' ){
				$where .= ' AND post_author='.$current_user->data->ID;
			}
		}
	}

	return $where;
}