File upload not working with unicode characters

[abbeycode]

Calling slack.files.upload('File 1.txt') will work, but slack.files.upload('File ∑.txt') gives the following error:

slacker.Error: no_file_data

I'm using Python 3

[os]

Just tried with cURL and it worked. This could be an issue with requests https://github.com/kennethreitz/requests/issues/2411

[abbeycode]

Thanks, it definitely looks like that's the case (though more accurately, Slack isn't properly handling an RFC standard that Requests implements). I'm taking it up with Slack.