I have a SharePoint list named project with columns :ID, projectname, projectdescription,status and the default attachment column
first I insert data into the Sharepoint list (iD,projectname,projectdescription,status)
then
I want to update the sharepoint list just uploading attachment on existing data.
I know how to add attachment file by using Form, but the problem is it inserts it into new row, not able to update an existing row based on update where conditions.
how do you update attachment columns[ not inserting into new rows]?