Please be aware that it isn’t really possible to put two photos side by side (even if it looks like there is room) as for most members their screens will show them one above the other.
Photo 327 does not exist

This results in two photos one above the other, effectively joined together.

Therefore, please be careful as you may get unpredictable results if you add too many photos to one post – try to keep it to just 1 or 2 photos added to a Topic or Reply.