How to update data of custom table using WebADI

Is there a way to update data of a custom table using WebADI (with "Table" Type interface)

I have already created one Table type interface referring a custom table and a Content to download the existing data. And using this I am able to insert new records to the table. But is there a way I can update the downloaded data also ?

While trying to update the downloaded data, it is just inserting the updated data as a new record (Actual requirement is to update that data instead of inserting a new record)