Purchase Return
The above link will lead you to the below screen.
Click on upload file to upload the excel sheet on the sheet (Upload Pop-up screen will appear)
Upload excel sheet
Attach the file from your system by clicking on "Click to Upload"
Click on "Upload" to upload your document or click on "Upload & Preview" to preview the document. Below screen will appear, if you want to make any changes you can make it and then click on "Save & Mapping" to proceed for mapping.
If directly clicked on "Upload" the below screen will reflect: Click on Complete at the end of the file for the mapping screen.
Click here for the next step after completing: Mapping.