EDITED: I figured it out, but I don't know how to delete this post. Apologies.
It's my first time using the fade feature, so it's likely I'm doing something wrong, but I did a fade in and out at the beginning and the end of an audio file. When I replay the entire clip while still in Wavepad it seems successful, I can hear both fades. But then I saved the clip and tested it in other software (Media Player) and there's no fade in or out. Any idea what I'm doing wrong?