files.delete

This method deletes a file

Arguments

This method has the URL https://slack.com/api/files.delete and follows the Slack Web API calling conventions.

Argument	Example	Required	Description
token	xxxx-xxxxxxxxx-xxxx	Required	Authentication token (Requires scope: `files:write`) ??
file	F2147483862	Required	Specify a file by providing its ID.

You will receive a standard Slack API response in JSON. If successful you get:

{
"ok": true
}

I would assume you get similar errors and warnings as with files.upload and files.info