problem with 'show product additional image'

[missingcat92]

I want to display additional image for the shop, and upload some image with regular filename via FTP, then include required template files. but those images didn't appear.
I found $flag_show_product_info_additional_images, seems very important, but it set to false.
Where can I set it true in admin area?

[kobra]

I want to display additional image for the shop, and upload some image with regular filename via FTP,

What is the image name for the product
What is the location path?

What is the image name for the additional image?
What is the location path?

[missingcat92]

um... I lost a letter in the filename... problem solved~