JSFiddle - React, Tailwind, and code Playground

HTML

<div class="col-sm-12  single"><span class="caldera-forms-conditional-field" role="region" aria-live="polite" id="conditional_fld_7213314_3" data-field-id="fld_7213314_3"><div data-field-wrapper="fld_7213314" class="form-group cc_1_titular" id="fld_7213314_3-wrap">
	<label id="fld_7213314Label" for="fld_7213314_3" class="control-label">first upload  <span aria-hidden="true" role="presentation" class="field_required" style="color:#ee0000;">*</span></label>
	<div class="">
		<div id="fld_7213314_3_file_list" data-id="fld_7213314_3" data-field="fld_7213314" class="cf-multi-uploader-list">
		  
      <!-- This block exists only when a file was uploaded*/ -->
      <ul class="cf-adv-preview-list"><li class="cf-uploader-queue-item fld_7213314_3_file_fl43783014677198 "><a href="#remove-file" data-file="fld_7213314_3_file_fl43783014677198" class="cf-file-remove">×</a> <span class="file-name">invoice-Y201837878.pdf</span>&nbsp;<div class="progress-bar" style="background:#ececec;"><div class="bar" id="progress-file-fld_7213314_3_file_fl43783014677198" style="height:2px;width:0%;background:#a3be5f;"></div></div><small class="file-type">application/pdf</small> <small class="file-size">26 kB</small><small class="file-error"></small></li></ul>
      <!-- End of block -->
      
		</div>

		<button id="fld_7213314_3_trigger" type="button" class="btn btn-block cf-uploader-trigger" data-parent="fld_7213314_3">Add</button>

		<input style="display:none;" accept=".pdf,.jpg,.png" class="cf-multi-uploader" data-config="{&quot;custom_class&quot;:&quot;cc_1_titular&quot;,&quot;attach&quot;:1,&quot;multi_upload&quot;:1,&quot;media_lib&quot;:1,&quot;multi_upload_text&quot;:&quot;Adicionar ficheiros&quot;,&quot;allowed&quot;:[&quot;application\/pdf&quot;,&quot;image\/jpeg&quot;,&quot;image\/png&quot;],&quot;max_size&quot;:2097152,&quot;notices&quot;:{&quot;file_exceeds_size_limit&quot;:&quot;O ficheiro excede o tamanho m\u00e1ximo de carregamento para este...

JavaScript

if ( $('#fld_7213314_3_file_list').children().length > 0 ) {
     alert("had file uploaded")
}