Gallery doesn't recognize a folder and doesn't appear. Pictures are still there though.

[Jelgoa13]

I downloaded some pictures, but then, in the morning, I couldn't open the gallery folder for downloaded pictures. I found them inside the SD and they open in the gallery, but I can't swipe to another picture, and the folder doesn't appear when I open my gallery.
I can open them from my files, but the whole folder doesn't appear in the gallery.