Can't browse for saved docs in Pixel C

[AC Question]

I recently got a Pixel C. So far I'm happy with it but I have a problem. I'm trying to apply for a job online but when sites over me the option to browse for my CV to attach it to my application it doesn't do anything. It does not open the browser despite I can click on the browse button. The doc is definitely saved in the tablet .
Is this a setting thing a need to change, an app that I need to download or something else?

Please help!!