The .url files that @Voice plugin for Chrome Browser places in the @Voice folder on Google Drive, are special proprietary format, and they contain text like this:
URL=https://hyperionics.com/forum2/tm.aspx?m=13337#13337
title=manually adding to @Voice folder on Google Drive | Hyperionics Support Forum
favIconUrl=undefined
If you want, you may create similarly formatted files yourself and upload them to @Voice folder on Google Drive, then the "Add from Google Drive" function on @Voice app's Rading List screen will work. You may also upload to that folder regular files for reading aloud (e.g. *.html, *.txt, *.doc, *.epub, *.pdf), or you may upload a .csv file with http links, one per line, and the app will also handle this correctly. The CSV files work best with linkKlipper add-on for desktop Chrome browser, you may check it out, it may turn useful if you want to add a lot of links from one web page (e.g. an online book chapter list or something similar)
Greg