I tried to post with images, but it would only allow one image and needed to be a jpg. It would be nice if it could be changed to the correct size or if the user could do so.
Hi AsusAssault! Welcome to the Gamer Community! Thank you so much for your feedback! We’re happy to see you here. 
There are image resizers located at the bottom right of the image of the post creator. But they’re only in 3 sizes.
We’re looking into the setting to allow for more than one image. It is possible, you’ll probably need to be a either a moderator or have a high Trust Level for your account