By default the phpFox script's image size limit is set to 500 kB, this is to avoid having members upload to big photos that takes up both diskspace and bandwidth on your member.
This can easily be edited from the AdminCP. This video shows you what type of error message you receive when you upload an image too big for your site's setting and where to change the photo size limit.
A great thank you for Master Yoda for participating in the video!
Would you prefer this tutorial described in text? Then read this tutorial!