TomTom recently announced the TomTom Sport Connect app and related services will be discontinued. More information can be found here.
Upload Files to Strava
If you exported your activity files prior to October 30th, you can follow these instructions to upload your activity files to Strava. If you've exported all your activities from TomTom you'll need to unzip the ZIP file before you can upload them.
Windows instructions on unzipping files: Zip and unzip files- Microsoft
Mac instructions on unzipping files: Zip and unzip files and folders on Mac - Apple Support