File upload with Rails 4 and Bootstrap -

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It's probably a simple (?) Fixed, but I can not seem to find it. I am working on a rail site and almost finished I have a form in which the file upload field is included (using a paperclip) to optimize, I am following the following.

I have this setup, but when I select a file, the file name is not being displayed. Here's the relevant bit of code from my site: 

    
 CSS (currently) matches what's linked in the above linked guide. I think I need to convert : image  to  f.text_field  to something else, but I can not understand it. Maybe it's a security thing.   
 
 
 No problem, I thought there was some underlying method for it. It seems that I had to add JS

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