How to configure default document

Hi,

my requirement is to set the default document so i have taken value from my database which i have already uploaded and i used those values into the linkfield with  a!documentDownloadLink but still i unable to see the document can you please help me where i went wrong, Below is my code.

a!localVariables(
local!text:"Please refer these document and send your reply soon",
local!newGrid:'type!{urn:com:appian:types:SHA}SHA_receivedDocuments'(),
local!emailSubject:"Sending mail regarding Property Documents",
local!document:40915,
local!docName:"Dummy Document",
{

a!sectionLayout(
          label:"",
          contents: {
            a!richTextDisplayField(
              labelPosition:"COLLAPSED",
              value:{
                a!richTextIcon(
                  icon:"file-text",
                  color:"ACCENT",
                  size:"LARGE" 
                ),
                a!richTextItem(
                  text:"Document",
                  color:"SECONDARY",
                  size:"LARGE",
                  style:"STRONG"
                )
              }
            )
          },
          divider:"BELOW"
        ),
a!gridLayout(
           headerCells: {

            a!gridLayoutHeaderCell(label:"Upload Document",align:"CENTER"),
            a!gridLayoutHeaderCell(label:"Document Type",align: "CENTER"),
            a!gridLayoutHeaderCell(label:"Document Description ",align: "CENTER"),
            a!gridLayoutHeaderCell(label:"Action")
          },
          columnConfigs: {

            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "ICON" )
          },
          rows:{
            a!forEach(
              items: ri!documents,
              expression: a!gridRowLayout(
                contents: {
                 if(
                   rule!FCO_hasValue(fv!item.receiveDocId),
                  a!fileUploadField(
                    label: "File Upload",
                    labelPosition: "ABOVE",
                    target:cons!SHA_FOLDER,
                    maxSelections:1,
                    value:fv!item.receiveDocId,
                     
                      
                    saveInto: fv!item.receiveDocId,
                    required: true(),
                 
                  ),
                  a!linkField(
                    links: {
                      a!documentDownloadLink(
                        label: local!docName,
                        document:todocument(local!document)
                      )
                    }
                  ),
                  ),
                  a!dropdownField(
                    label: "Document Type",
                    labelPosition: "ADJACENT",
                    placeholder: "Select the type of document",
                    choiceLabels:cons!SHA_TYPESOFDOCUMENTS,
                    choiceValues:cons!SHA_TYPESOFDOCUMENTS,
                    value:fv!item.docType,
                    saveInto:fv!item.docType,

                  ),

                  a!textField(
                    label:"Document Description",
                    placeholder:"Enter document description",
                    value:fv!item.docDescription,
                    saveInto:fv!item.docDescription,


                  ),
                  a!richTextDisplayField(
                    label: "Rich Text",
                    labelPosition: "COLLAPSED",
                    value: {a!richTextIcon(
                      icon: "trash",
                      link: a!dynamicLink(
                        saveInto: a!save(ri!documents,remove(ri!documents,fv!index)
                        )
                      ),
                      size: "STANDARD",  
                      color:"NEGATIVE",

                    )},


                  )

                }

              )
            ),


          },
          selectionValue: ri!documents,
          selectionSaveInto: ri!documents,
          addRowLink: a!dynamicLink(
            label: "Upload file",
            value:true(),
            saveInto:{ a!save
            (ri!documents,append(ri!documents,{local!newGrid}))
            } ,


          ),


        ),

   }   
   )