Free faxing isn't revolutionary, you can send one with www.freefax.com or with www.faxzero.com and they have been around for years.
I wound up futzing around with iAnnotate on the iPad, which required a bit more effort but actually worked.
Sorry it didn't work out for you. We had a day where we redid our document converter. It's possible something happened while we were pushing out changes. If you have a moment, mind trying it again and pinging us at support at hellofax dot com?