Hey mate, nah we should be able to upload up to 20mb photos as we had issues on our photo threads from good quality cameras putting out 10-15mb images so we thought stuff it and maxed it pretty high.
Printable View
Just right click on an image you have taken in portrait and select edit it should open paint by default, if it does just select resize and just go 50 x 50 percent, go file, then save as and rename ( so you don't loose any image quality on the original ) and then upload and see if that fixes your issue.
I done a quick test and it worked for me