Hi, Marisa from Fort Worth, I'm Richard from Dallas…
If I understand this, you want to be able to organize your Hidden pictures into albums and keep the pictures hidden, is that right? But there is only one Hidden album, and albums can't contain other albums.
Here's a workaround: In Hidden, Select All, (be sure to get them all,) then go to More (•••) and choose Add to Album. Hit + to create a new album-- name it MyHidden, or something. It's weird, because when you look in this album it will be empty! They're all hidden!
Then, when you want to look at the pictures, you can go to Hidden, select them all, and choose UnHide. They will disappear from Hidden, which will now be empty, and all your hidden pictures will be visible in MyHidden and whatever albums they come from. The point of the MyHidden album is that now you can send them all back to Hidden without having to track them down.
If you want to divide them up, you can organize the now visible hidden pictures into albums as you like. If you want, you can put the new "to be hidden" albums in a single folder. When you're through, you can go back to My Hidden and re-hide them all. Then, at your leisure, unhide all in Hidden, look through albums, then hide all again in MyHidden.
If you add more pictures to Hidden, be sure to add them to My Hidden, as well, so you don't lose track of them when you unhide them again.
Will this work for you?