Hi Susana,
Unfortunately, unoconv seems to break on https://demo.moodle.net pretty often...and it is broken right now, so I would expect that you get no success. You can check this yourself. If you notice when you go to that site, it says you can log in as admin. Do so, and go Site administration > Plugins > Document converters > Manage document converters. You should see that Google drive is NOT Enabled, and that there is NOTHING listed under Unconv, Supported document conversions. If you click the link for, Settings, for Unoconv, you will see a red X which indicates the path is wrong to the document converter.
If you post your revised docx file, I will test it on my server. I would give you access to my server, but my only PostgreSQL Moodle is on my internal network only.