Custom Sounds in iHost

i have been using the TTS which is working great, i have the iHost connected to a bluetooth speaker in my house and i want to have it say “You Got Mail” but the way AOL used to when the door opens on the mailbox. i have a WAV file here on my computer what i would like to have ihost play. does anyone know how i can get it there or if i can replace the WAV file generated by TTS docker app with the one on my local computer?

I think they haven’t opened up the storage access