Open Road generates a FIT file that can be uploaded to Strava manually (Read more here). To upload the FIT file, you go to https://www.strava.com/upload/select, select ‘File’, and click the ‘upload’ button.
Pick the file you just generated and your FIT file will be uploaded to Strava. Once it is uploaded, do not pick indoor cycling:
Instead, pick ‘Virtual Ride’:
Now your ride will appear on Strava as a virtual ride:
You also have the option to have your training session uploaded to Strava automatically. Please read more here.