Textures gone missing

I was making my texture pack and then all of a sudden like half of my textures went missing! I still have a working version of my texture pack with all of my textures in it, but I don’t know how to upload that and then edit it as well. I tried pressing the Import files button because that seemed like the logical solution but it did absolutely nothing. Please help!

Edit: I see now what the Import Files button does, but it still doesn’t help at all.

SOLUTION: After a couple minutes I gave up, but eventually had an Idea. I extracted the Texture Pack onto my desktop and in the site, clicked on “local” to see my Texture Packs. With the Import Files feature I Imported the extracted Texture Pack as an editable Texture Pack. A very simple solution that crossed my mind completely.