So my preview does work and the speech bubble shows up but not the words. Check it out :
Hmm… I’ve not experienced this glitch so far but I’m using the Mean Girls text font, maybe it’s just the Demi Lovato one?
I’ve used the preview like a 1000 times already, it’s been just recently that the words won’t show up.
I’d advise submitting a ticket to the Episode support team.
I’ll try that out