Can you upload a file to the Slack API using files.upload as a different user?
<p>I'm trying to find a way to have an application post a text snippet to our support channel through the Slack API.  Using the files.upload method, I can create a text snippet and share it with the channel, but the post appears to come from me (because the token used to authenticate the request is mine).</p>

<p>I'm looking for a way to do this, but make it appear with a custom user name and icon, like you can with the chat.postMessage method's username and icon_url parameters.  Is there a way to achieve this?</p>