Can't seem to delete unused imported videos on the document assets tab

Since Adobe Xd only allows for 20 imported videos per document I’m trying to remove the ones I’m not using but no matter what I do, they can’t be deleted even when the video isn’t used in the canvas. There is no delete option when I right click the asset (even though this article mentions that it should be possible).

I’ve also tried putting the videos in a new group and then deleting the group but the videos would then still reappear.