Looks like they need samples in all these configurations, "compressed and uncompressed and all the crops (1:1, 4:3, 3:2, 16:9)". Looks like 8 in all. Not having needed to submit samples (camera supported) the process looks straight forward. Instructions on page state what they are looking for. Well exposed probably indicates no over or under exposed areas. Maybe name files to indicate crop and if compressed or not.