It means, you cannot put multiple photos on a single thread you submitted to the contest..you should separate each photo, meaning 1 thread 1 photo = 1 entry
Almost every app nman.. usually nawawala lang ang EXIF kapag ang photo ay hindi mismong file.. like inupload mo sa FB at download mo ulit tapos upload sa ibang site, yan malaki tendency na mawala yung exif... FB especially nawawala ang EXIF talaga kapag galing na dun ang photo mo