When you’re on the ZIN Play app, you can go to the MUSIC tab and click on ALL MUSIC. Once you’re there, you can click on the filter on the top right of the screen and turn OFF the ZIN music filter. This will show all of your local music that is available on the app. You can use this same filter when you are adding a song to a playlist.
iPhone - make sure your music is downloaded to your phone. Go to the MUSIC app on your phone, click on the Library tab, and click on Songs, and find the song you are looking for. Make sure the song does NOT have a cloud icon next to the song title. If it does, that means your song is stored on the Cloud and not on your phone. Click on the cloud to download it onto your phone. Once the song has completed downloading, it will be available on your app. (Note: If you still cannot see the song, please shut down the app and re-open it. Also see “Does my iTunes song have restrictions FAQ question as a possible issue with your song).
Android - You can also access any music that is saved locally on your phone. (Note: Google Play songs are not actually saved locally on your phone. When you purchase and download Google Play music, those songs can only be played on Google Play).