ruby on rails - how to add an upload button to active admin -

i trying add button call popup windows upload file on server. looking paperclip alternative without need use image preprocessor.

user flow going next: - log in active admin - click create new photo - pick photo using file picker (a place stuck) - upload selected picture onto cloudinary or similar it.

i use paperclip afraid require many other dependencies on production server. advice, friend?

the simplest solution can think of looks this:

activeadmin.register user   form :html => { :multipart => true } |f|     f.inputs "upload"       f.input :image, :type => :file     end     f.actions   end end 

maybe missed multipart attribute? nevertheless, i'd suggest take @ carriverwave (https://github.com/carrierwaveuploader/carrierwave).

if not helping @ all, please post code examples. make easier others provide useful feedback.