[Python] How to upload file using Slack API as user?

Right now, the token used when uploading files via files.upload is associated with my Slack user account. So any uploads performed using this token appears to have been made by me.

However, I'd like to specify something like as_user (which is available when using chat.PostMessage), which will make the upload appear as if it was uploaded by specified Slack user. Is this possible?

I have this:

upload_file(filepath='/path/to/file.jpg',
channels='#uploads',
title='my image',
initial_comment='pls give me some feedback!')


And here's the function being called:

import os
import requests

TOKEN = your_token_here

def upload_file(
filepath,
channels,
filename=None,
content=None,
title=None,
initial_comment=None):
"""Upload file to channel

Note:
URLs can be constructed from:
https://api.slack.com/methods/files.upload/test
"""

if filename is None:
filename = os.path.basename(filepath)

data = {}
data['token'] = TOKEN
data['file'] = filepath
data['filename'] = filename
data['channels'] = channels

if content is not None:
data['content'] = content

if title is not None:
data['title'] = title

if initial_comment is not None:
data['initial_comment'] = initial_comment

filepath = data['file']
files = {
'file': (filepath, open(filepath, 'rb'), 'image/jpg', {
'Expires': '0'
})
}
data['media'] = files
response = requests.post(
url='https://slack.com/api/files.upload',
data=data,
headers={'Accept': 'application/json'},
files=files)

return response.text


I did find this existing question, but I don't find the answer clear at all on what could be done to make this work.

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