Help with save as PDF with Dynamic File Name: ActiveSheet.ExportAsFixedFormat method

Hi all,

I am working on an application to help us track our chemical applications. In the attached .xlsm file, the user would fill out the fields highlighted in blue on the "Field Application Sheet" tab. Then the "Save Form" button will have the primary function of saving the range B8:L42 as a PDF file with a dynamic file name. There are also header and footer fields that will need to be published with the PDF but I understand that if I set the IncludeDocProperties = True then they should be. In the attached example the file name I would want is:

"ChemApp_JQ Applicator_123456_St. John's Hwy ROW_3/20/2018_12:00:00 PM.pdf"

I am using the following code:

Sub SaveClear_Form()

    Dim AppName As String
    Dim WrkOrdr As String
    Dim Location As String
    Dim AppDate As Date
    Dim AppTime As Date
    Dim PDFName As String
    
    Set wb = ThisWorkbook
    Set ws = wb.Worksheets("Field Application Sheet")
    
    'Get values from form fields to generate dynamic file name
    AppName = ws.Range("D9").Value
    WrkOrdr = ws.Range("H10").Value
    Location = ws.Range("D13").Value
    AppDate = ws.Range("C35").Value
    AppTime = ws.Range("D35").Value

    PDFName = "ChemApp_" & AppName & "_" & WrkOrdr & "_" & Location & "_" & AppDate & "_" & AppTime & ".pdf"
 
    ChDir "U:\ExcelTraining\Excel App Develop\Chemical Application Sheets"
    'Error Occurs Here: Run-Time ERROR '-2147024773 (8007007b)':
        'Automation error
        'The filename, directory name, or volume label syntax is incorrect
    ws.ExportAsFixedFormat Type:=xlTypePDF, Filename:= _
        "U:\ExcelTraining\Excel App Develop\Chemical Application Sheets\" & PDFName _
        , Quality:=xlQualityStandard, IncludeDocProperties:=True, IgnorePrintAreas _
        :=False, OpenAfterPublish:=True
    
End Sub

I've tried to research the issue but it's a bit over my head. I've been researching this problem for two days and have not been able to translate what I've found into a solution.
This is the first time I've tried using the ExportAsFixedFormat method. I appreciate the help. Thanks.

--TFiske