Hi,
In the front-end, you can upload files. It could be any type of file: images, videos, audio, zip... HikaMarket will not make any difference.
You just have to set the extension as the authorized extensions in the HikaShop configuration.
I am not sure I understood your second question.
HikaMarket have a fee system, the main vendor will take some fees on the vendor sales. It is not specially linked to papal.
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.