Unless you have permission from all concerned parties, it is not possible to upload songs with uncleared samples.
You are welcome to upload remixes of your own work. However, if your remix is of another artist's song, or contains any part of another artist's original music, stores require permission from the original artist.
How to credit a remixer
If you're remixing your own song, enter the song title as: "Song title (Remix)"
If your song has a remixer, here's how to credit them on the Upload page:
- List the original artist’s name in the Artist/band name field;
- Format your song title as “Song Title (feat. Artist 2) [Artist 2 Remix]”, where Artist 2 is the remixer.
(This will help stores properly tag the remixer's artist page. They'll remove the featuring credit when tagging the profile.)