Yes. During the trial period, you are restricted to 100MB of total uploads. Once you upgrade to a paid subscription, that 100MB limit is lifted. Files can be linked to songs, services, and teams you have created.
To learn more, including who can access uploaded files and how what SP lets you do with MP3s, read the Upload Files article.
Updated
Our offices will be closed on Monday, January 20th, in honor of Martin Luther King Day. Regular business hours will resume on Tuesday, January 21st.
"I have decided to stick with love. Hate is too great a burden to bear." - Martin Luther King Jr.
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