<button class="btn btn-sm btn-success link-btn"
        (click)="open()">
  <i class="fa fa-upload" aria-hidden="true"></i>
  Add file
</button>

<button class="btn btn-sm btn-success link-btn" (click)="open()">
  <i class="fa fa-upload" aria-hidden="true"></i>
  Add file
</button>

<!--
<div class="btn-group">
  <span #uploadFileButton type="button" class="btn btn-sm btn-success" (click)="open()">
    <i class="fa fa-upload" aria-hidden="true"></i> Upload file</span>
  <button type="button" class="btn btn-sm btn-success dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true"
    aria-expanded="false">
    <span class="sr-only">Toggle Dropdown</span>
  </button>
  <div class="dropdown-menu dropdown-menu-right">
    <a (click)="open()" class="dropdown-item">Upload file</a>
    <a class="dropdown-item">Upload folder</a>

    <div class="dropdown-divider"></div>
    <a class="dropdown-item">Upload from url</a>
  </div>
</div>
-->
Add dropdown upload button comment
Add dropdown upload button comment
