The default WooCommerce product upload form for vendors has limitations. And it’s too hard to have custom fields on the form unless you are a good coder! However, WP User Frontend is a smart choice in that case for the non-coder people. WPUF let users create a product form with the custom fields. You can learn
Incompatibility or conflict between plugins may cause an error on your WordPress site. You may have tons of plugin installed & activated on your site and need to find out which plugin or theme causing the problem. What are the best practices to find WordPress themes and plugins conflict? Some people suggest trying