How do i limit the file type to .pdf with the choose file button

I have added the choose file button to my site to allow people to attach their resume. I want to limit the file type to ONLY .pdf files. Can anyone tell me how to do this please

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Square

I don't think there's a way to limit the file type. Are you using this on a contact form? I believe you can add a little note to clarify the type of document you are looking for. 

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