What is the “file section”?
You can write your own file browser and get the file objects, to present as you wish:
{
"id": "file-abc123",
"object": "file",
"bytes": 120000,
"created_at": 1677610602,
"filename": "salesOverview.pdf",
"purpose": "assistants",
}
There is no other metadata that you can add, except by tracking with your own database.
You could thus make your own “assistants file attacher” interface or such.