Inline audio player in Sanity.io rich text

Learn how to add a custom inline block to Sanity's portable text editor and display it in the front-end. Audio files are hosted in Sanity's CDN.
Links to documentation:
Information on the file schema type: www.sanity.io/...
Block type: www.sanity.io/...
Configuring the portable text editor: www.sanity.io/...