TL;DR
- YouTube Music appears to be testing a new feature that allows users to search within playlists.
- The feature was spotted on the iOS version of the YouTube Music app, and its rollout seems to be extremely limited as of now.
- Android users are not yet seeing the feature in their apps.
YouTube Music appears to be quietly rolling out a long-requested feature — the ability to search within playlists. Users have been asking for this feature for years, and it now looks like Google is finally responding.