How to attach an existing file to a document

[Peer]

It pains me to see that this seems to be so difficult and so much underdocumented that a longterm forum participant like you seems to get frustrated to the point that you ask if this is even possible.
Why wouldn’t it?

I just tried the search on this forum with “attach file python” and found this which, depending on the precise situation of where your code-to-be needs to be located, might help you or not:

How to create an attachment in Python

The File DocType has two fields called attached_to_doctype and attached_to_name. So let’s say you want to attach a file to a Customer. You’d do it like this: file = frappe.get_doc("File", "4ab1a860dc") file.attached_to_doctype = "Customer" file.attached_to_name = "John" file.save()

Best!