Do you know of a way that a file can be attached to a task?
Looks like that’s a requested feature, not implemented yet.
I know files can be attached to cards in the Deck app, which itself can create Task events. Perhaps that workflow will do what you need?
Unfortunately I don’t use Deck because it doesn’t allow me to do what I’m looking for, I use the tasks directly because I can create subtasks, something that isn’t possible with Deck.