These articles contain images from external systems like Unsplash. When you edit an article and select a new image then does the media manager show the images from the external system and not from the local web server. More information about external system integration like Dropbox, Google drive or Microsoft can be found in the official DPMedia documentation.
The header article shows an image directly from unsplash.com. If you inspect the image path in the dev tools of the browser, then you will see that it is an url directly pointing to the image from unsplash.com.
The header article shows an image from unsplash.com, but served locally for better privacy. If you inspect the image path in the dev tools of the browser, then you will see that it is a local path on the web server.
The header article shows an image directly from another Joomla site. If you inspect the image path in the dev tools of the browser, then you will see that it is an url directly pointing to the image from that site.
The header article shows an image from another Joomla site, but served locally for better privacy. If you inspect the image path in the dev tools of the browser, then you will see that it is a local path on the web server.