How to link bank feed deposits to created invoices/sales receipts to reconcile?

You don’t have to link individual sales transactions to bank feed records manually when using Synder. In order to reconcile make sure you have synced your Payouts (money transfers to your bank) which will ensure that a “Match”/”Confirm” button appears in your Bank Feeds for you to click on (not “Add”). That’s it, the rest is done automatically.
You will be able to see sales/fees transactions in the clearing account in the Chart of Accounts (i.e. “Stripe Bank Account”).

Once the payouts are synced, you will see that your Bank Feed reconciliation is ready, just confirm the prematched options.