| Hey Robert.
Ummmmmmmm. I haven't been able to upload my own music yet although they have that as an option. So, I've been using their fairly limited selection.
As to embedding.....once your video is processed there'll be a box (think it's Red) that'll show as toolbox or something. Open it & embed/share is option you want.
I'm digging that you can edit videos AFTER you've done them....add, delete, change music etc.....