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Give your coworker the real file. Whatever it produces comes back the same way — as a file you can open, check and download.
A spreadsheet produced by a coworker, rendered as a table in the files panel

A finished reconciliation, open beside the conversation. No download, no second application.

Two places files live

This is the one thing worth understanding, because it explains most questions people have.

Task files

Belong to one task. Anything you upload into a conversation and anything your coworker produces there. Private to that task — no other task can see them, unless your coworker shares them in a handover.

Coworker files

Belong to the coworker itself. Available in every task it runs. This is where its instructions, personality and skills live.
So a spreadsheet you uploaded on Tuesday isn’t in Thursday’s task. If you want something available every time — a price list, a template, a style guide — save it to the coworker instead.

What’s on the coworker’s Files tab

Alongside anything you’ve saved there, you’ll find a few files that control how your coworker behaves. Each is labelled in plain language so you’re never editing something whose job you have to guess: Your coworker’s skills, helpers and saved dynamic workflows live here too. A run’s own records don’t: each temporary helper’s transcript is saved in that task’s files. An edit to a saved dynamic workflow applies the next time it starts, even in a task that’s already open.
Changes to Instructions and Persona apply to new tasks. A task already running keeps what it started with. Permissions apply from your coworker’s next turn.

Working with files

Good to know

Upload the whole file rather than pasting part of it. Your coworker handles a real export far better than forty pasted rows, and it keeps your conversation from filling up.
Task files are discarded with the task’s private workspace when it ends. Download anything you want to keep, or ask your coworker to save it to itself.

Common questions

It’s in yesterday’s task. Open that task, or save the file to the coworker so every task can reach it.
Not directly — files belong to a coworker or a task. Upload it to each. Or, when one coworker hands work to another, it can share its workspace so both work in the same task files. Without that, only words travel between them.
Each task’s files are isolated to that task and discarded when it ends. Nothing is shared between tasks or coworkers unless you put it there. The one exception is a handover where your coworker shares its task files with the coworker it asks.
Spreadsheets, documents, PDFs, images, and plain text and data files. See Previewing files for what opens in place.

Next steps

The file manager

Browse, upload, download.

Previewing files

Open anything in place.

Attaching and mentioning

Point at a file mid-conversation.

Working with code and files

The capability behind all of it.