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#20
Yeah, which I'm not doing with my thousands of images. Goodbye hard drive space. Microsoft dropped the ball with this one. Not even my synced theme has all my images, just a small selection.
Edit: Actually, I might be able to do that. Still, not even remotely practical, but if that's what I have to do...
Edit 2: Alright, I'm using the Wallpaper Library that I set up earlier to source my images, then copying everything in a type:image search to a folder I have titled "Wallpapers 'Library'". Turns out I have less than 4,000 images altogether, which is apparently less than 4 GB, which I can spare.
Again, not very practical, but if anybody else is looking for how to tell Windows 10 to have multiple folders in a slideshow, this is about the only way I can think of without third-party tools which may be too old to work properly.