DLC's and BC

Switched to XBox One and play Reach in the backwards compatible version.
I noticed that the DLC-packs don’t show up.
Anyone knows why and how to fix this?

If you have had them on Xbox 360, all you have to do is “manage game” or “view in store” on Xbox One and you can see all the DLC’s for Reach. If you already had them, you don’t have to rebuy them and can just redownload them.

OK! Thanks.