You can attach a photo to a post. It appears (on my computer) as an image about 4cm x 5cm.
It is possible to click on the image to get a better view. It then appears (on my computer) as a magnificent 4.5cm x 5.5cm! 
Is it me (is there something in settings?) or you? Is it possible to make the picture bigger, please? People often post blocks of text and I just cannot read them.