Upload Multiple Files On Insert

Hi,

Please I really need some advice to implement this. Don't even need the code... I just need some ideas.

When user is creating a new record, I don't know the id of this to link the uploaded files. How can I link the the uploaded files to this record? I think maybe I can upload the files and store the files IDs on a session and then after user saves the record I'm able to link them. But I don't think this is right. Can someone help me? Have anyone done this before?

Thanks