How do I change standard cover to slip in My collection?

[J___T]

Specifically I was noticing that while my Vikings Season 1 shows up automatically as the image of the deluxe slipcover, the 2nd and 3rd seasons show up as the naked cover.

I know how to upload cover art, or distinct release versions, but going to the Vikings Season 2 and 3 pages, someone has already uploaded the slip, front and back, as alternative views for the standard version, which, after all, is what's underneath.

So how can I choose those front slips as the images I view for those titles in "My collection"?

Thanks!