Is there a widget that allows taking a picture from the mobile, and is saved as a file?

Hi,

Yes it is possible with Jotform. You can take a photo and upload that picture.

Please check the Ink File Picker widget.

http://widgets.jotform.com/widget/filepickerIO

You have to sign up for an account in Filepicker website and grab the API key:  https://www.filepicker.com/ 

Please, check this guide for more information:

http://www.jotform.com/help/218-How-to-Take-Pictures-on-Your-Forms.

If you have any question or issues, please do not hesitate contacting us .We will be glad to assist you.