File: //proc/self/root/proc/self/cwd/wp-content/plugins/wp-file-manager/lib/js/i18n/help/en.html.js
<h2>Operation Tips</h2>
<p>Operation on the UI is similar to operating system's standard file manager. However, Drag and Drop is not possible with mobile browsers. </p>
<ul>
<li>Right click or long tap to show the context menu.</li>
<li>Drag and drop into the folder tree or the current workspace to move/copy items.</li>
<li>Item selection in the workspace can be extended selection with Shift or Alt (Option) key.</li>
<li>Drag and Drop to the destination folder or workspace to upload files and folders.</li>
<li>The upload dialog can accept paste/drop clipboard data or URL lists and Drag and Drop from other browser or file managers etc.</li>
<li>Drag start with pressing Alt(Option) key to drag out to outside browser. It will became download operation with Google Chrome.</li>
</ul>