What should I do if a Riverside recording is stuck at 97% processing?

At 97%, I'd treat it as an upload that hasn't quite finished, not something to clear out. Keep Riverside open on the same device and browser profile and let it sit for a bit; upload time depends on the recording length and connection. Check the Studio or Recordings page to see whether one participant's track is still uploading, since an incomplete track can hold things up. Don't clear the browser cache or site data yet — Riverside says unfinished local tracks can be stored in the browser. If it still doesn't move, use Riverside's upload-recovery steps or contact support, and mention which participant is stuck and the recording link.