Internet-based music player are not fully supported on mobile devices such as smartphones and tablets and therefore the music changes to our default tune when viewing a Slidely video on such devices.
To avoid this, simply edit your video and change the music from a Youtube track to an mp3 track uploaded from your computer.
How can I upload music from my computer? - https://slidely.zendesk.com/hc/en-us/articles/200795561
If you did not select a Youtube/SoundCloud track, and a different music has been added to your video other than the one you've selected- please contact us at email@example.com and make sure to provide us with the name and link to the song that you have chosen.