Because that's not how it's designed...
The structure should be as follows:
Aurora\User\Import\<TitleID>\titlename.txt
Aurora\User\Import\<TitleID>\description.txt
Aurora\User\Import\<TitleID>\publisher.txt
Aurora\User\Import\<TitleID>\developer.txt
Aurora\User\Import\<TitleID>\releasedate.txt
Aurora\User\Import\<TitleID>\genre.txt
Aurora\User\Import\<TitleID>\banner.jpg
Aurora\User\Import\<TitleID>\banner.png
Aurora\User\Import\<TitleID>\banner.dds
Aurora\User\Import\<TitleID>\cover.jpg
Aurora\User\Import\<TitleID>\cover.png
Aurora\User\Import\<TitleID>\cover.dds
Aurora\User\Import\<TitleID>\background.jpg
Aurora\User\Import\<TitleID>\background.png
Aurora\User\Import\<TitleID>\background.dds
Aurora\User\Import\<TitleID>\screenshot1.jpg
Aurora\User\Import\<TitleID>\screenshot1.png
Aurora\User\Import\<TitleID>\screenshot1.dds
Aurora\User\Import\<TitleID>\screenshot01.jpg
Aurora\User\Import\<TitleID>\screenshot01.png
Aurora\User\Import\<TitleID>\screenshot01.dds
the screenshot filenames indicate the index at which they should be placed, you can add up to 20 screenshots numbered either starting with 0 (01, 02, 03, 04 etc. up to 09) or as a single digit (1, 2, 3, 4 etc. up to 9) you can of course also go 11 - 20 as they areYou should only have a single one of the above image formats, (jpg, png or dds), they're options you have, most likely you'll be using jpg or png