How can I restrict file extensions in my Upload field?

You can specified the allowed extensions in the File Upload element. Go to the Advanced tab of the form, and in this field:

Allowed file extensions

you can see that the default allowed extensions are:

zip,rar,pdf,doc,xls,ppt,jpg,jpeg,gif,png

You can modify that as you wish. Just note that you should NOT put a dot (.) before the extension name.

 

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