Hi Motlaq,
Welcome to the Community! 
(@msmurfitt thanks for the help with this)
-
@msmurfitt is correct, once you cancel the subscription for your plan, you cannot update the UI for example or change the styles of an image, etc… you can read more about it here.
-
That is correct, you cannot use Airtable (or any other data source that is not .csv) because pulling data from external collections (google sheets, airtable, xano, etc…) needs to use external collections (paid plan feature) and/or custom actions (basically pulling data but with an API)
-
I’m pretty sure @AddyEdwin is an expert in this topic (using Airtable), you can read more here.
I hope this helps! 