Plan Duo

Premium

Country USA

Local Files from Macbook Air iOS 10, trying to sync onto Andoid Phone, LG G7 ThinQ

I have a playlist on my desktop Spotify from local files, and it plays fine on my Macbook. But on my Spotify app on my LG G7 ThinQ, the playlist appears but with no songs in it - they're not even grayed out, just nothing is there. I've tried every fix I've found here...uninstalled and re-downloaded Spotify desktop and mobile, am definitely on the same network on both, I tried plugging my phone into my laptop and using the USB hotspot and then wifi hotspot, my firewall is off on my laptop, I've tried playing the song from my laptop and then switching to listening from my phone, and the song just stops. I've downloaded the latest version of quicktime. The files are definitely a supported filetype (Mp3) and are recordings from a rehearsal so definitely shouldn't come up as illegal. Unplayable songs are set to show, local files show in both devices, I've downloaded the playlist on my laptop....I made extra space available on my phone (there is 10GB free and the playlist is 45 songs that I want to sync), and it is one of my 5 devices because it has tons of other downloaded songs on it, so it shouldn't be that either.

What am I missing!?

I've used this feature in the past, multiple times. It's always just worked. I'd create a playlist from my Macbook using local files, and then when on the same Wifi, I'd open my LG G7 ThinQ phone, I'd see the playlist full of songs, I'd download it for offline use. Done. I could play those songs from anywhere. The only thing that has changed is I've added the Duo subscription, but I was premium then and premium now, so why should that matter? Please help!