Contact form 7 upload not working with windows phone

I am currently using contactform 7 on my website. One form has an upload function for pictures. Where android and iphone open a window where you can choose either camera or file if you tap the upload button, windowsphone does nothing. Al other buttons/dropdowns etc work.

Is this contactform related or windowsphone or related to the personal settings of the user? I can't seem to find any topics about this on internet.

Any ideas? Thanks

via Chebli Mohamed