Soundfont playback on musescore.com

So I just installed a soundfont and it works perfectly fine in the program while I'm writing my music. I can hear the difference and in the Synthesizer everything is correctly working
But then, I uploaded my score online and I hit play and the default soundfont plays.
I thought I would be able to hear the newly installed soundfont but the default one just plays. Also, the audio sources section of my score is not there. I have been able to switch soundfonts on other scores I've seen...
Maybe this is a rookie mistake but, is it possible for musescore.com to play my soundfont like it works in the program? How would I do that? Maybe I didn't save it right?