How upload every activity after a hiatus/break?

I recently restarted my xert subscription after a 4 month hiatus. I have ridden alot during that time, so how do i sync everything for an updated fitness signature?

Assuming the data you want to sync is on Strava see 10th tip down on this page –
Frequently Asked Questions – Xert (

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Thank you.

Was a bit fast though and deleted all my activities on xert and is now in the process of reuploading 2K activities…