To update a Mix Project that has been previously Finalized, you will need to create a new copy.
- Login to your account, and on the top right select "Completed Mixes" under the Mixer App tab.
- Locate the project in the Completed Mixes panel.
- Click “...” under options.
- Select “Duplicate Mix.
- Enter the Title of the New mix and click “continue.”
- Make any Changes as needed, and Finalize.