scinote-web/app/views/shared/_asset_link.html.erb

<% if asset.file_present %>
  <% if asset.file.processing? && display_image_tag && asset.is_image? %>
    <span data-status='asset-loading'
          data-present-url='<%= file_present_asset_path(asset.id) %>'>
      <%= image_tag 'medium/processing.gif' %>
    </span>
  <% else %>
    <%= link_to download_asset_path(asset),
      class: 'file-preview-link',
      id: "modal_link#{asset.id}",
      data: { no_turbolink: true, id: true, status: 'asset-present', 'preview-url': asset_file_preview_path(asset) } do %>
      <% if asset.is_image? && display_image_tag %>
        <%= image_tag asset.url(:medium) %>
      <% end %>
      <p><%= truncate(asset.file_file_name,
                      length: Constants::FILENAME_TRUNCATION_LENGTH) %></p>
    <% end %>
  <% end %>
<% else %>
  <%= image_tag 'medium/processing.gif' %>
<% end %>