While Soundiiz is able to add elements like Tracks, Albums and Artists to your music collection, we are not able to keep the order of the original source. That means we are not able to set the "added date" when adding elements with APIs to the destination platform.
As Soundiiz can only add elements to favourites lists with APIs, this limit is for every platform listed on Soundiiz. Keep 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 hope to the destination music service to order it (and they are all doing this differently).