app/views/content/form/images/_upload.html.erb
<div class="nested-fields">
<%= f.fields_for :image_uploads do |upload_form| %>
<div class="row">
<div class="col s11">
<%= upload_form.label 'Select a file to upload' %>
<div class="file-field input-field">
<div class="btn white black-text">
<span>Browse</span>
<%= upload_form.file_field :src, name: "image_uploads[]" %>
</div>
<div class="file-path-wrapper">
<input class="file-path validate" type="text" placeholder="Upload file">
</div>
</div>
</div>
<div class="col s1">
<br />
<br />
<%= link_to_remove_association f do %>
<i class="material-icons red-text" style="position: relative; top: 10px; left: -15px;">close</i>
<% end %>
</div>
</div>
<% end %>
</div>