Attach Files to Invoice - eConnect

Hi,

I would like to know how the documents are attached to an invoice using eConnect.

From UI, I click on Purchasing->Transaction Entry and select Document type as Invoice.

Near to Voucher Number field, I notice a piece of paper icon-> paper clip icon-> OLE Container-> Edit->Insert New Object... -> Select Object Type and attach a doc.

If I have to attach, save or delete files to an invoice, how is it possible with eConnect?

Can someone please let me know?

Any information on this will be helpful.

Thanks in advance..!!