How to do wicked_pdf image rendering

how do I get images of a product to show in pdf?

I have this code in view file

<div id="img-slide">
    <% for asset in @car.assets %>
    <%= image_tag(asset.asset.url(:medium)) %>
    <% end %>

and it shows all images for this car.

but if I use the same code in show.pdf.erb then instead of images I got only question marks.. like the image missing thing. So, is there a way to get them on paper? Thanks.

p.s. there is what console is showing

  Asset Load (0.2ms)  SELECT `assets`.* FROM `assets` WHERE (`assets`.car_id = 29)
  Carmodel Load (0.2ms)  SELECT `carmodels`.* FROM `carmodels` WHERE `carmodels`.`id` = 28 LIMIT 1
Rendered cars/show.pdf.erb (255.2ms)
"***************/usr/bin/wkhtmltopdf       -q - - ***************"


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