This #happens due to restricted #wordpress media permissions. Make sure #vendors have the correct capabilities to upload media. Some #WooCommerce multi vendor plugins limit media access for #security; adjust settings to allow it. If using #frontend #dashboards, ensure media uploader scripts are loaded #correctly. File upload limits or file type #restrictions in #hosting can also block #image uploads.

https://store.webkul.com/woocommerce-multivendor-marketplace.html