trouble with saving file to directory

Try this,

Edit: I forgot to mention, you only need the full path of the directory you want to check.

Sub FilePath()
  Dim fPath
 On Error GoTo Ext
     fPath = "C:\YourPathHere"
    If Not Dir(fPath, vbDirectory) = vbNullString Then
       MsgBox "Folder exists"
    Else
      MsgBox "Folder does not exist"
    End If
    
Ext:
    On Error GoTo 0
End Sub

Check out this example.
Click the button, a userform will pop up and a combobox will populate with the folders in the C drive and the textbox will show what is in Range("L10")
Select a folder and click "Make New Folder" A folder will be made with the name that is in the textbox.
Click the button again, select the same folder in the combobox and click "Make New Folder"

You will get a message box telling you that the folder already exists.

It would be a good idea to first make a test folder in the C drive for experimental purposes.
Then you can select the test folder in the combobox