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Two ways to put a file in front of your coworker, depending on whether it’s already in the task.

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Attaching

The paperclip in the message box, or drag a file onto the conversation. Attached files appear above the box before you send, so you can check you grabbed the right one and remove it if not.
Two attached spreadsheets shown above the message box before sending

Attachments sit above the box until you send, each with its size and a way to remove it.

Attach when the file is new to the task.

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Mentioning

Type @ and a menu of the files already in the task appears. Keep typing to filter, pick one, and it’s referenced in your message.
The mention menu listing the task's files with their sizes

Everything already in the task, with sizes — so you can tell two similar exports apart.

Mention when the file is already there and you want to be unambiguous:
That says exactly which two files, with no room for your coworker to pick the wrong one.

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When mentioning is worth it

  • More than one file in the task could plausibly be the one you mean
  • Filenames are similar — export.csv and export-final.csv
  • You’re referring back to something from earlier in a long conversation
  • The task has a lot of files and you want to be precise
Otherwise, just describe it. “The sales export” works fine when there’s only one.
Mention rather than re-upload. Uploading the same file twice gives your coworker two copies and a decision to make about which is current.

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Good to know

Attaching a file adds it to the task’s files, so it stays available for the rest of the conversation. You attach once, then mention it afterwards.
Attach several at once when they belong together. “Reconcile these two” with both attached is clearer than two messages.

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Common questions

Yes. Whether your coworker can look at it depends on the model — the picker marks the ones that accept images. See Effort and model.
It reads what it needs for the job. Saying what you want from the file — “just the totals row” — keeps it efficient on a large one.
Files saved to the coworker are available in every task automatically, so there’s usually nothing to point at. Naming it in words is enough.
Remove it from the strip above the box before sending. After sending, just say so — your coworker won’t quietly use the wrong one.

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Next steps

The file manager

What’s already in the task.

The conversation

Everything else in the message box.

Previewing files

Check what you attached.

Files overview

Where files live.