So I did some testing and created a picture library 6 levels deep with 6kx4k JPEG pictures. Using the native Kodi uPNP browsing the pictures do not show up. However using the Mezzmo Kodi addon it works perfectly. I think it has to do with Kodi adding the pictures to its database with the native client. If you want to use Kodi, I'd suggest leveraging the Mezzmo addon. I use it as my default Kodi client for everything, videos, audio etc. It has a number of enhancements over native Kodi uPNP support or as Peter says for Android use the Mezzmo Android app. I also tested the Mezzmo Android app on an old Google Nexus 7 tablet. It works fine and has the ability to set a time interval for slideshow viewing.
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