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, streaming services require permission from the original artist.
If you are remixing your own song...
...You do not need to credit yourself as a remixer. You can simply add "Remix" as version information. Here's how you do that on the upload form:
Under the Add "version" info to song title? section, list the appropriate version information. In this case, we can select "Other" and just write "Remix"
Under the section that says Song title preview: you should see something like this:
YourSongTitle (Remix)
If you are uploading remixes of your own song by a remixing artist...
...You will only need to add a collaborator with the "Remixer" role, no need to worry about adding version info. Here's how you do that on the upload form:
Under the Add featured artist to song title section, please indicate "Yes" and select the role of the artist. In this case "Remixer." Please then enter the Remixing artist's name in the box next to the artist role.
Check out this article for a breakdown on artist roles!
Under the section that says Song title preview: you should see something like this:
YourSongTitle (RemixingArtist Remix)
If you are uploading a remix of another artist's music...
...You must have permission from the artist to do so.
If you have permission from the original artist to upload your remix of their song, you will need to list the original artist's name in the "Artist/band name" section of the upload form. Note that this will use an additional artist slot. If you need more artist slots you can upgrade here.
At the track level, you will need to add your artist name with the "Remixer" role. Here's how you do that on the upload form:
Under the Add featured artist to song title section, please indicate "Yes" and select the role of the artist. In this case "Remixer." Please then enter the Remixing artists name (in this case your artist name) in the box next to the artist role.
Check out this article for a breakdown on artist roles!
Under the section that says Song title preview: you should see something like this:
OriginalSongTitle (YourArtistName Remix)
In the Songwriter section, do not select cover song -- Remixes are not covers.