Images that you insert in content page can be displayed enlarged with a tap of your finger. For this purpose, only the following small addition is necessary:
Then switch to the HTML source code view.
The image displayed there is now still enclosed with an "A" HTML tag (FIGURE tag in the case), so that the app then reacts accordingly when you tap on it and displays the enlarged view.
After applying the changes, the image will be enlarged when touched.
Tip: Should not be displayed a blue frame around the image. Suffices it as shown within the IMG tag the area style="outline:0px;" additionally to deposit!