You need Lightroom 5, using that you can import your images and sound files to create slideshow.
Hope it helps.
NOT the correct answer.The trouble is that I see this behaviour with LR 5.7.1.. With MP3 files, there is a exclamation mark that pops the info "This is not a valid music file" with all mp3 files. m4a files work fine
The suggested blog video clearly showed how to add an mp3 file, so the intention is to support this. There must be a setup prerequisite to allow it REALLY work.Does anyone know. Is it really a 32-bit vs 64-bit OS issue. Or is it a Windows Firewall issue? I don't want to buy this tool if nobody can tell me how to make it work as advertised.