Custom View : display fields linked to file upload field?
Thanks for the link, I'll read it.
I finally got an answer on drupal.org that suits perfectly.
The idea is to use the "Custom text" field :


  
  Add title, image, file and Custom Text field to your view.
  List item
  Edit Title, Image field and check exclude from display option and
  save.
  Edit File field and check exclude from display checkbox, In
  Formatter drop down select "URL to file" and save.
  Edit custom text field
  Click to "REPLACEMENT PATTERNS"
  
  
  Here you can find tokens for title, image and file fields. E.g. {{ title }} fir Title field and {{ field_image }} for image
  field.
  Copy {{ title }} {{ field_image }} and paste it to Text.
  Then click to "REWRITE RESULTS"
  Check "Output this field as a custom link" and enter File field token {{
  field_my_file }} to "Link Path" textfield. Save this field.
  Save the view and now its ready.