Question

How can I allow certain file types to be uploaded in the Extra Question Field plugin?

Also I want to show the user an error which says " Only X, Y, and Z file types are allowed." (in red color) when the user wants to upload a file type other than what I mean.

Edit:
I mean by file types this file extensions: tex, bbl, doc, jpg, pdf, png, txt, zip, ftx, log, bst, bib, cls, sty.

Comments

What is "certain file types"? Explain more in detail.
And, What is your "Permit only images (jpeg,png,gif)" option of EQF plugin?

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@sama55: Thanks for your comment. I updated my question.

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I re-tested with *.doc file. *.doc file was uploaded correctly.
Confirm "Permit only images (jpeg,png,gif)" option on your plugin panel.

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Currently my users can upload each file extensions but I want only this extensions: tex, bbl, doc, jpg, pdf, png, txt, zip, ftx, log, bst, bib, cls, sty.
Could you please help me?

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You may be able to realize by customizing qa-eqf-filter.php. This is customization request that relate only to you. If you can not customize, ask technical support of ASKIVE.