The till now sits at the same address as NiagaKit and the staff app. That is what lets the menu, sales, refunds and clock-ins pass between them with nothing to export.
A browser keeps saved data per web address, so none of that follows the till to the new one on its own. Save it to a file here first, then restore that file the first time you open the new address — before the first sale of the day.
Open the till at its new address →https://ybd-office.pages.dev/pos/
Update your bookmark and home-screen shortcut — this page will not be kept forever.
The old till is still readable at app.html if you need to look something up.