Posted: 07/08/2013 at 22:44
Hi Tony, I think it's something to do with the file size as well as the pixel size. If the test image below works, I'll post back with my settings.
OK, that worked.
My camera produces pictures of 3072 x 2304 at about 3 to 4 MB each. However, if I upload them as-is, they don't work, so I open them in Irfanview (a free PC image viewer/editor) and use SaveAs to save them as jpeg at 75% quality which keeps them the same pixel size but compresses them to about 1MB in file size. Any other application which can do this should also work.
Hope that helps!