Why Does Minecraft Resource packs NOT show up?

After you download a resource pack that you want, it should download as a ZIP file, you need to copy that ZIP file into the resource folder. Don't unzip the ZIP file, just copy it directly to the resource folder.

When you download the ZIP file, place it somewhere where you can find it. Next, start up Minecraft and go to options, Resource Packs, and click on (Open resource pack folder).

Next, take the ZIP file, right click it and click on copy and then in the resource folder click on Paste, and it will copy and move over your ZIP file. Next, you should be able to drag it to the right side where it says selected resource packs. You should just select it then to use it and it should switch everything over.

If you did all that and it doesn't work, then it's probably not a resource pack. You can open the ZIP up to look at its contents to see if it is or isn't.