You have to upload extension separate from the qvf upload and publish process, on every server. Since you have created it, don't you have the zip file? Upload to you test server...
The fllename is not the same on server as the one that you have locally in your zip file. The take the QMC id that was assigned upon uploading
Thank you Yianni.
I think part of the issue with locating the widget is that I didn't create the original widget/library through QlikSense Desktop, but rather through hub on the development server. Does a widget library have to be created in Desktop in order to be able to export/zip it up and deploy it to other servers?