While Soundiiz can add elements like Tracks, Albums, and Artists to your music collection, we cannot keep the order of the source. That means we cannot set the "added date" when adding elements with APIs to the destination platform.
As Soundiiz can only add elements to favorites lists with APIs, this limit is for every platform listed on Soundiiz. Keeping the track order in a list is only possible for tracks in a playlist.
Elements in favorites lists will be bulk added, and then, it's hoped the destination music service will order it (and they are all doing this differently).