Creating, Filling and Saving PDFs via VBA

Hello, I am having some issues with a VBA script. I am fairly new to this so there may be some issues I don't see.

My main issue right now is that the forms are being filled but the save function is not working. I can see the forms are being filled but closed without saving. ultimately leaving me with blank forms. 

I downloaded and installed the SDK as per the page I found but maybe I don't have the right ones enabled or installed.

Also my script is a mishmash of a ton of other threads I've found online so maybe its faulty from its base level.

Thanks in advance!

Sub FillDocuments()

'Step 1 Define Variables
Dim FileNm, gApp, avDoc, pdDoc, jso
Dim i As Integer
Dim Path As String
Dim ProjectName As String
Dim EQID As String
Dim SubNum As String
Dim FileName As String
Dim QCForm As String


'LOOP Start
i = 2
Do

'Step 2 Define Data from Excel Sheet
ProjectName = ThisWorkbook.Worksheets("EQData").Cells(i, 1).Value
EQID = ThisWorkbook.Worksheets("EQData").Cells(i, 2).Value
SubNum = ThisWorkbook.Worksheets("EQData").Cells(i, 3).Value
QCForm = ThisWorkbook.Worksheets("EQData").Cells(i, 4).Value


'Step 3 Define Data For Files Location
FileName = SubNum & " " & EQID & " " & QCForm & ".pdf"
Path = ThisWorkbook.Path
FileNm = Path & "\" & FileName


'Step 5 Open and Update Fields In Each Form
Set gApp = CreateObject("AcroExch.app")
Set avDoc = CreateObject("AcroExch.AVDoc")
If avDoc.Open(FileNm, "") = True Then
    Set pdDoc = avDoc.GetPDDoc()
    avDoc.BringToFront
    Set jso = pdDoc.GetJSObject
    jso.getfield("ProjectName").Value = ProjectName
    jso.getfield("FirmwareV").Value = "Test"
    jso.getfield("SubName&Num").Value = "Test"
    jso.getfield("Location").Value = "Test"
    
'Step 6 Save changes to the PDF document (I assume this is where the issue is)
    pdDoc.Save PDSaveIncremental, FileNm
    pdDoc.Close

End If

'Close the PDF; the True parameter prevents the Save As dialog from showing
avDoc.Close (False)


'Some cleaning
Set gApp = Nothing
Set avDoc = Nothing
Set pdDoc = Nothing
Set jso = Nothing

'Iterate down the list of documents
i = i + 1

Loop While ThisWorkbook.Worksheets("EQData").Cells(i, 4).Value <> ""

End Sub