How to apply a format conversion in eager chained transformations?

In order to apply the format conversion, you should use put the format parameter outside of the chained part of the transformation.

The SDK will add the 'format' you provide to the end of the URL.

For example, using our Ruby SDK for Rails:

<%=
 u.cl_image_upload(:picture, :html => { multiple: true }, :use_filename => true, :eager_async => true,
  :eager => [
    { :format => 'jpg', :transformation => [
        { :crop => :fit, :height => 300, :width => 300},
        { :flags => "relative", :height => 1.0, :overlay => "my_overlay", :opacity => 60, :width => 0.8}
      ]}
  ])%>