It’s important to get a sense of what was happening in the app at the time of the issue. With the Viewer, you can playback the user session, view user events in the timeline, and add comments in the video.
When you switch to DevTools, you’ll see everything you’d find in Chrome Devtools except now they’ve been super charged with time travel. For the first time you’re able to jump from a user event to where the event was handled and from a log in the Console to where the log was emitted. For the first time, you can start time traveling!