Hi all,
To be able to submit data from a self created form in which drop down is present and submit to database use COLLECT function in PowerApps
Collect('[dbo].[POS_Target]',{POS_ID:Value(POSID.Text),Country_Name:Market.Text,POS_Name:POSName.Text,MONTH_NAME:Month.Selected.Value,Year_Detail:Value(Year.Selected.Value)})
A drop down would require Selected.Value and if it is a number then it requires cast and hence bound it by (Value)