Android Question How can use try catch to trap error in case file is not there

If File.Exists(Starter.Provider.GetFileUri(FileName1)) = True Then ' first attachment
    ' Add your first file here
    email.Attachments.Add(Starter.Provider.GetFileUri(FileName1))
End If
If File.Exists(Starter.Provider.GetFileUri(FileName2)) = True Then ' second attachment
    ' Add your second file here
    email.Attachments.Add(Starter.Provider.GetFileUri(FileName2))
End If

    Try
        
    Catch
        Log(LastException)
    End Try

    Try
            Dim FileName As String = "CURCULARS.PDF"
            'copy the shared file to the shared folder
        
            File.Copy(File.DirInternal, FileName  , Starter.Provider.SharedFolder, FileName )
            Dim email As Email
            email.To.Add(EmailAddress.Text)
            email.Subject = "Homework"
            '    email.Attachments.Add(Starter.Provider.GetFileUri(FileName ))
            email.Attachments.Add(Starter.Provider.GetFileUri(FileName )) 'second attachment
            Dim in As Intent = email.GetIntent
            in.Flags = 1 'FLAG_GRANT_READ_URI_PERMISSION
            StartActivity(in)
            ProgressDialogHide
        Catch
            MsgboxAsync("The File Not Detected Please Try Again. ","Homework Downloaded")
        End Try