Hi,
I checked the code and I see that there is no specific triggers for the "file save" in HikaShop and HikaMarket does not add triggers for the "file upload" in the front-end.
For the trigger "onAfterProductCreate" and "onAfterProductUpdate", you can have the files in some conditions but the files are stored in another table. So I think that the best will be an addition of triggers.
In the table "hikashop_file", you can find the product files using the "file_type" column ("product" value) and the "file_ref_id" (which will contains the "product id").
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.