Hi Dwight,
Lauren is correct that there is not a way to load the files onto WikiTree's servers. Like with video files, you need to host them elsewhere and link them. Since you have them on your personal website already, maybe that will be easy.
Chris
P.S. Although we could think about adding this sort of functionality in the future, it's unlikely we will. Since we're a free website, we need to carefully contain hosting costs. Video and audio files can take up a lot of space and become expensive to host.