Uploading Map Markers from Airtable

I have coded an app that, once you place a map marker, saves the longitude, latitude, and title of that marker to Airtable. Now, once users open the app, I want all the longitudes and latitudes saved to Airtable to automatically upload and create map markers. How would I go about coding this?

This is what I have so far:

Are you looking for the when Screen1.opens block here @bobsunscreen?

Would it be easier to have a button to push this data when the user is ready to submit it?