@sarah_newi Sorry about that. The YouTube video feature relies on the uploader to do some work to sync. If they haven't done this, you can use the "Disable Sync" button to avoid the distracting highlighting and scrolling.
(There's room for Readlang to improve here I know)
New feature rolled out to premium users: Review Summaries! https://t.co/4YQmDF56Hc
(Some have had this already, but it's now rolled out to more languages and users)