I have lightroom 5.6, the latest I believe, and I cant seem to add music to my slideshow. I purchased an Amazon .mp3 file that plays in VLC, Windows Media etc.. but I cant get it to work within lightroom. I keep getting a message that reads- "The selected file is not a valid music file". The file is valid and I bought it specifically for this slideshow. Please help
Did you ever get a solution? I had same issue with LR5.6 (CC) with 32bit OS Windows10. I asked for help too, but none received before expiry of trial. Same music file was fine with PSE13 trial version.