@shindakun @manton Unfortunately, the timeline won't render iframes or JavaScript. But there's hope! 😊 Make sure there's a nice fallback to supported HTML elements, and your shortcode should work just fine.
For example, your Bandcamp shortcode could output a link right below the iframe integration.
C​:​\​>COPY *.* A: /V by MASTER BOOT RECORD on Bandcamp