switch/application/admin/view/general/attachment/add.html

<form id="add-form" class="form-horizontal form-ajax" role="form" data-toggle="validator" method="POST" action="">
    {if $config.upload.cdnurl}
    <div class="form-group">
        <label for="c-third" class="control-label col-xs-12 col-sm-2">{:__('Upload')}:</label>
        <div class="col-xs-12 col-sm-8">
            <input type="text" name="row[third]" id="c-third" class="form-control" />
        </div>
    </div>

    <div class="form-group">
        <label for="c-third" class="control-label col-xs-12 col-sm-2"></label>
        <div class="col-xs-12 col-sm-8">
            <button id="plupload-third" class="btn btn-danger plupload" data-multiple="true" data-input-id="c-third" ><i class="fa fa-upload"></i> {:__("Upload to third")}</button>
        </div>
    </div>
    {/if}

    <div class="form-group">
        <label for="c-local" class="control-label col-xs-12 col-sm-2">{:__('Upload')}:</label>
        <div class="col-xs-12 col-sm-8">
            <input type="text" name="row[local]" id="c-local" class="form-control" />
        </div>
    </div>

    <div class="form-group">
        <label for="c-local" class="control-label col-xs-12 col-sm-2"></label>
        <div class="col-xs-12 col-sm-8">
            <button id="plupload-local" class="btn btn-primary plupload" data-input-id="c-local" data-url="{:url('ajax/upload')}"><i class="fa fa-upload"></i> {:__("Upload to local")}</button>
        </div>
    </div>

    <div class="form-group">
        <label for="c-editor" class="control-label col-xs-12 col-sm-2">{:__('Upload from editor')}:</label>
        <div class="col-xs-12 col-sm-8">
            <textarea name="row[editor]" id="c-editor" cols="60" rows="5" class="form-control editor"></textarea>
        </div>
    </div>
    <div class="form-group hidden layer-footer">
        <div class="col-xs-2"></div>
        <div class="col-xs-12 col-sm-8">
            <button type="reset" class="btn btn-default btn-embossed">{:__('Reset')}</button>
        </div>
    </div>
</form>