Not renaming duplicates & allowing spaces

I have a form which uploads to a server. The Upload sb is set that if the file exists, to rename [NewFileName]_[Increment]. But I am being allowed to upload dups.

Also, I do not want spaces allowed in the file names. I'm not sure where the best place to set this. If I select the Spry Text field for the Upload File, the Properties panel says the Widget appears damaged and to either replace it or go into code view and repair it. I'm not sure how do this without wrecking the form. If I go to WA Server Validations and double click on the validation for that field - ((isset($_FILES["Upload"])&&isset($_FILES["Upload"]["name"]))?$_FILES["Upload"]["name"]:"" - I see that Allow Spaces Without Characters is not checked, so I would think this wouldn't be allowed.

Thanks for any help.