Fetching Image link from one doc type to another doctype

I am trying to fetch doc link from a custom document that I build and has an option for attachment

frappe.ui.form.on(‘Upload Purchases’, “refresh”, function(frm){
frm.add_custom_button(__(“Book Purchase”), function() {

    let lcv = frappe.model.get_new_doc('Purchase Invoice');

    lcv.date_of_uploading = frm.doc.posting_date;
    lcv.attach_invoice = frm.doc.invoice_attachment;

    frappe.set_route("Form", lcv.doctype, lcv.name);



Unable to do it using above code

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