title: Bootstrap FileInput Fill Input Value in Initial Preview
body: <p>I am using Krajee Bootstrap File Input. The Problem is that in my Edit Page I want to display the initialPreview of a PDF file from a record, but when I submit the form for update, the file input sends null value.</p>
  
  <p>Here's my code:</p>
  
  <p>Form --</p>
  
  <pre><code>&lt;div class="form-group col-md-4"&gt;
       &lt;label for="pdf_file"&gt;Document&lt;/label&gt;
          &lt;div class="file-loading"&gt;
             &lt;input class="file" name="pdf_file" id="pdf_file" value="" type="file"&gt;
          &lt;/div&gt;
    &lt;/div&gt;
  </code></pre>
  
  <p>JS -- </p>
  
  <pre><code>$("#pdf_file").fileinput({
    theme: "fa",
    allowedFileExtensions: ["pdf"],
    maxFileCount: 1,
    showUpload: false,
    showCaption: false,
    overwriteInitial: true,
    fileType: "pdf",
    browseClass: "btn btn-primary btn-md",
    initialPreview: [                 
     "http://localhost/local_storage/aPxU3p71hpLjaI3lbTXrjRuigUxU94pq.pdf",
    ],
    initialPreviewAsData: true,
    initialPreviewConfig: [
      {type: "pdf", size: "100%", width: "100%", key: 1},
    ],
   });
  </code></pre>
  
  <p>Thanks in advance!! </p>