The conversion is happening through a Xerox Workcentre 6605. There are options as to the type of file, but they are all things like JPEG, TIFF, etc. The preferred method where I work is PDF. All we do is put the document in the scanner, select the email address it is going to, and the machine does the rest.
It seems to be a problem with my computer settings. I scanned a file and emailed it to my coworker, who had no problem downloading and renaming it. I scanned the same file in the same method and emailed it to myself, downloaded it, and tried to rename it only for it to not save the change.
No idea what is causing this.