From the source

Audio Inputs

Upload or record audio to create songs from any sound.

Capability change

Suno released an Audio Input feature that lets Pro and Premier users upload or record audio clips of 6–60 seconds to create songs.

Copyrighted works are blocked from upload, and inputs with vocals remain private and unsearchable.

From the source
All Pro & Premier users can now upload or record their own audio to make any song you can dream of.
suno.com

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