Check the WSDL itself - it should show you the WSDL URL. Usually the Endpoint is the WSDL... it's not simply just a file, but more of a URL. Usually around line 2 or 3 in the wsdl.
<xsd:schema targetNamespace="https://graphical.weather.gov/xml/DWMLgen/wsdl/ndfdXML.wsdl">
IF it doesn't have .wsdl just add it and put it in Chrome (as long as you're on your work network/VPN).
Scondly - I find is very rude or bad practice that "Whomever" gave the project to you doesn't show you where or how to get the WSDL. Plus it's better to have the WSDL URL so you can update definitions and/or refactor.
So - You can do yourself a favor and play the "good charm" and simply ask "I'm looking for the WSDL URL so that I can update the definitions as development continues. Stick to that. Because if you start testing form an old testStep.
I wouldn't get into using wsdl as a file - it's just not the best way to go about it - UNLESS you have to for some odd reason. So if it is in Git/SVN and they update them there - then you need that.
Now as for Exporting - where you copying/pasting the WSDL Content from the Tab? OR you sing the actual Export feature?
That's the only way I know it would be slightly different - namely only the first line something like
<?xml version="1.0" encoding="UTF-8"?>
Depending on the where the source code is - Maybe GitHub or SVN - you should have access to that. Plus for a Good QA Role - should have a Repository as well to store the project, so others can use it.