Click on go advanced and scroll down to attach files. click on manage attachments. Click on choose file and choose the file and then click on upload. You will see at the bottom the max six of the file. I use a jpeg file and adjust the file by size and/or definition to be less the max allowed.

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas