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/usr/share/help/as/gnome-documents/prob-previews.page is in gnome-documents 3.22.1-1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" style="task" id="prob-previews" xml:lang="as">

  <info>
    <link type="guide" xref="index#question"/>
    <revision pkgversion="3.5.90" date="2012-09-05" status="review"/>
    <revision pkgversion="3.12" date="2014-03-16" status="review"/>

    <credit type="author copyright">
      <name>জুলিটা ইনকা</name>
      <email its:translate="no">yrazes@gmail.com</email>
      <years>2012</years>
    </credit>
    <credit type="editor">
      <name>মাইকেল হিল</name>
      <email its:translate="no">mdhillca@gmail.com</email>
      <years>2012</years>
    </credit>
    <credit type="editor">
      <name>Ekaterina Gerasimova</name>
      <email its:translate="no">kittykat3756@gmail.com</email>
      <years>2014</years>
    </credit>

    <include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>

    <desc>You can only preview files stored locally, on Google Drive or
    ownCloud.</desc>
  </info>

  <title>Why do some files not have previews?</title>

  <p>When you open <app>Documents</app>, a preview thumbnail is displayed for
  documents that are stored locally, on <em>Google Drive</em> or
  <em>ownCloud</em>. Those stored in <em>OneDrive</em> show as missing (or
  blank) preview thumbnails.</p>

  <p>If you download a <em>OneDrive</em> document to local storage through the
  web interface, a thumbnail will be generated.</p>

  <note style="important">
    <p>The local copy of a document downloaded from an online account will lose
    its ability to be updated online. If you want to continue to edit it
    online, it is better not to download it.</p>
  </note>

</page>