Photo on map

I read the documentation, but I do not understand - how to see the photo from the device in the web-interface?

It shows in the popup.

Maybe there is an example of what it looks like? A screenshot ? Thank you!

You can add the image by pressing on that pencil next to the red bucket in the popup window and then click on Device image in the dropdown menu.
Remember to click Save afterwards at the bottum of that menu.

Sorry, I meant photos taken by the device itself and sent through the exchange protocol to the server. They can be seen on the map at the point where they were taken?

You can enable it in the pop-up, but it will show as a link.