There is only one way you can upload pictures to Youtube and that's by uploading a profile photo. Youtube is for uploading videos, not photos of images. If you're trying to create a slideshow on Youtube, you will need to use video editing software to create the slideshow then upload it to Youtube.

Windows Movie Make is a basic user-friendly video editing program that comes with the Windows operating system. Windows Movie Maker is great for creating slide shows from image and videos, you also add music to the slide show.

Create a slideshow using WIndows Movie Maker