This seems like a form element level validator would fix this by verifing that only a single new file is being posted. Perhaps compare to existing files added to the field, and make sure only one new file is added at a time.

Lucas

On Wed Jan 14 2015 at 8:06:42 AM Nancy Wichmann <nan_wich@bellsouth.net> wrote:
They need to be able to upload another file on the next update, so setting it to one doesn't work.
 

From: muhammed naushad <naushunaushad24@gmail.com>

You can set maximum number of values users can enter for this field to be one. 

Go to admin >> select the field from content type >> update the number of values

If you want to keep this settings as unlimited then you can use form validation function. 


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