Http to https question and storage issue

Question 1 :
Is there a different way to make the site https? I used this method to force the page to be https.
But there will be an error when storing MP3

I use LAN: http://192.168.100.178:9000 he will work, but after https will error

Question 2 :
Can I change the recording file MP3 to WAV or something else?