When browsing I love how we can easily and quickly see under the videos if it has been added to favourites (heart) or added to Watch Later (while also being able to easily add to a playlist without heading to the video page)
I feel it would be beneficial to add 2 more icons under videos:
Icon to show if you have downloaded the video previously - if not possible maybe a button people can toggle themselves
Icon to show if it's added to one of your playlists
Currently trying to keep track of which videos I have downloaded and using the 'watch later' button for a workaround as it's easy to spot while browsing
Maybe something like this?
