I've searched everywhere I can think of, and I believe the answer is that you cannot, but I figured I'd ask anyway. Whenever I use the MediaLibrary.SavePicture method, it always puts the pictures in the "Saved Pictures" album. I see no options available to save to a different folder.
I know you can access multiple albums (code below), but how do you save pictures to different ones?
using (var library = new MediaLibrary())
// get all the picture albums
PictureAlbumCollection pictureAlbums = library.RootPictureAlbum.Albums;
// get a specific album like the Camera Roll
PictureAlbum cameraRollAlbum = pictureAlbums.Where(album => album.Name == "Camera Roll").FirstOrDefault();
// get the pictures in the album
var cameraRollPictures = cameraRoll.Pictures