All Expend card transactions are already synced with Xero – there’s no need to sync the transactions themselves before you can start record expenses.
All transactions performed with your Expend card appear in the Expend app on the Activity screen. To create an expense report, tap any purchase transaction to open it, tap the + button to add an image of the receipt (optional), fill in any other details, and then tap Save. The transaction record in Xero will be updated with the details and attachments you provided.
The app shows you which transactions have been processed as expenses with a green "Expensed" tag on the right.