How to import downloadable filenames from CSV

-- HikaShop version -- : Business: 2.3.5
-- Joomla version -- : 3.2.3
-- PHP version -- : 5.3.3

I have a problem importing dowloadable filenames from a csv.
I have ebooks with 2 file assigned to them. One of them is free dowloadable, but onother one is NOT free.
I have imported a product with a variant (import_filenames.csv). I have no errors when I import filenames(import_result.jpg) and the file name appears whe I open the product in the backend (backend.jpg).

I have next files configuration Upload folder = media/com_hikashop/upload/ ; Upload Secure folder = media/com_hikashop/upload/safe/

I have uploaded my free file (Indice_978-84-8468-347-6.pdf) into media/com_hikashop/upload/ folder and not free one (9788484684060.epub) into media/com_hikashop/upload/safe/ folder (the filenames exactly matches uppercase and lowercase). But when I access to my product via frontend and click in free download link I obtain a "File not found" error message. Hikashop assign a download URL finished with /product/download/file_id-186. If I export my product I obtain export_filenames.csv.

Is there anythig wrong?
Please Helpme. I have hundreds of products to import and do it manually is not an option.

Regards

Hi,

All the product files needs to be in the upload safe folder, even the free ones

I try to upload files to safe folder and it works.

Thank you