Rendering with custom Template fails

[promotion]

I'm using FileAttachmentField on a frontend . When a form is called with
$form->setTemplate('MyCustomtemplate');
FileAttachmentField is not rendered (only the Browse button is displayed as for single file)

Tried renaming template to remove "_holder" bit , but it then complains that my browser does not support HTML5 .

Frontend is Bootstrap based, however removing all css/js does not help :(

My form template below:

<form $FormAttributes>
    <% if $Message %>
    <h4 id="{$FormName}_error" class="message $MessageType">$Message</h4>
    <% else %>
    <h4 id="{$FormName}_error" class="message $MessageType" style="display: none"></h4>
    <% end_if %>


    <fieldset class="">
       <div class="col-md-6">
                    <h3>Test Upload</h3>
                      <div class="field fileattachment supportedt" id="Failai">
                        <label for="changeProfileForm_ProfileForm_Slapyvardis" class="">Upload files</label>
                        <div class="middleColumn">
                            $Fields.dataFieldByName(Failai)
                        </div>
                        <span id="{$FormName}_error" class="message $Fields.dataFieldByName(Failai).MessageType">
                            $Fields.dataFieldByName(Failai).Message
                        </span>
                    </div>

       </div>

        $Fields.dataFieldByName(SecurityID)
    </fieldset>
    <% if $Actions %>
    <div class="Actions">
        <% loop $Actions %>$Field<% end_loop %>
    </div>
    <% end_if %>
</form>

[promotion]

OK, I copied new Form.ss as a core, pasted everything i need and used
$FieldHolder
for calling your field
This worked just perfectly !