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It happened all the time when I am trying to import a sound or music...
Wanna know a trick i learned ENTIRELY by accident? Just make a copy of that sound file, THEN import it. Trust me, it works, and idk why.
Really? c: that's completely weird, but thanks! I will do it!
MOST OF THE TIME it does. If it doesn't, try Googleing it...
Well, sometimes it does import it when I close and open the Flash
if it doesnt work then use format factory to fix the file
That's what I use, but sometimes it doesn't work and sometimes yes... it's weird