Basic transaction data (such as amount, currency, date, etc.) is automatically sent to Xero when you set up the integration. It'll be available on the left-hand side under the 'Reconcile' tab of the relevant Xero bank account.
Transaction metadata (attachments, notes, Xero Categories, etc.) you export from the 'Xero' page under 'Reports' will be available on the right-hand side under the 'Reconcile' tab of the relevant Xero bank account.
Therefore, when you go into the 'Reconcile' section under 'Accounts' in Xero, you should see and reconcile the basic data (bank feed) on the left-hand side and the metadata on the right-hand side.
For more on this, see: