What eBay gets
A Seller Hub upload file in the eBay UK report format: title, description, condition, price, quantity, item specifics and up to 12 images. Category IDs and item location are asked once and remembered.
The description is written for the piece, not from a template: metal in KT, stones in ct, every visible flaw in the Condition section, and no price or market commentary where eBay's rules dislike it.
One form to fill, or none
Most dealers upload the file: eBay takes it as drafts, add postage, publish. Dealers who list one piece at a time can use the EasyListings Publisher extension (beta): it opens the eBay form in your own logged-in browser and fills the fields it mapped, then you check and press publish.
The extension never submits a listing. If eBay changes its form, the job report names the step that failed, and the file route still works.
The same piece everywhere else
The same finished listing also becomes files for 1stDibs, Catawiki, Shopify, WooCommerce and the rest, plus copy you can paste anywhere. One piece is written once.