Adding product's image url to database

-- HikaShop version -- : 2.6.1

Hi there.

I'm trying to add products by custom php codes. I managed to do this and I can add a single product as well.
Now I'm wondering where can I add images? I get image url from an external xml source. In which table of hikashop I have to add??

Thanks.

I found hikashop_file table. That's ok.

But now there is a problem. I can't add images from an external source. Is it possible to add a full url??
Thanks.