title: Magento2 how add image uploader field in admin cms
body: <p>Magento2 - How can i add image up-loader field in Admin cms page.</p>
  
  <p>Added code on below path
  app\code\namespace\moduleName\view\adminhtml\ui_component\cms_page_form.xml</p>
  
  <pre><code>    &lt;field name="page_image"&gt;
          &lt;argument name="data" xsi:type="array"&gt;
              &lt;item name="config" xsi:type="array"&gt;
                  &lt;item name="dataType" xsi:type="string"&gt;string&lt;/item&gt;
                  &lt;item name="source" xsi:type="string"&gt;page&lt;/item&gt;
                  &lt;item name="label" xsi:type="string" translate="true"&gt;Page Image&lt;/item&gt;
                  &lt;item name="visible" xsi:type="boolean"&gt;true&lt;/item&gt;
                  &lt;item name="formElement" xsi:type="string"&gt;fileUploader&lt;/item&gt;
                  &lt;item name="elementTmpl" xsi:type="string"&gt;ui/form/element/uploader/uploader&lt;/item&gt;
                  &lt;item name="previewTmpl" xsi:type="string"&gt;Magento_Catalog/image-preview&lt;/item&gt;
                  &lt;item name="required" xsi:type="boolean"&gt;false&lt;/item&gt;
                  &lt;item name="sortOrder" xsi:type="number"&gt;40&lt;/item&gt;
                  &lt;item name="uploaderConfig" xsi:type="array"&gt;
                      &lt;item name="url" xsi:type="url" path="catalog/category_image/upload"/&gt;
                  &lt;/item&gt;
              &lt;/item&gt;
          &lt;/argument&gt;
      &lt;/field&gt;
  </code></pre>
  
  <p>Created page_image field in cms_page table. Image-preview is showing when I upload image. But how to save image (Database and server) and how to show uploaded image in edit mode . </p>