Your collection is a catalog of records you actually own, kept separate from your wishlist and from what you currently have for sale.
Add a release one at a time with full details, the same way you’d create a listing, or bulk import your entire Discogs collection in one shot. The Discogs import is a one-time pull, not an ongoing sync, so anything you add to Discogs afterward has to be imported again to appear here.
Your full collection lives at /collection, in list or tile view, with the same filters you’d use to browse the marketplace.
Any item in your collection can be listed for sale directly from that page. Clicking “List for Sale” opens a new listing pre-filled with what we already know about the release, so you only need to add condition, price, and photos. Once it’s listed, the item shows as already for sale and won’t offer the button again.
Collection is for records you already own, wherever you bought them. It’s not the same as your Wishlist, which is for records you want, not records you have.