slackr_csv simplifies the process of sending a data frame to Slack as a CSV file. It is highly recommended to leave the filename argument as the default (tempfile), as changing it will persist a csv file in your working directory.
filename: the file to save to. Defaults to a tempfile. Using the default is highly advised, as using a non-tempfile will write a file that persists on the disk (either in the working directory, or at the location specified).
title: Title of file.
initial_comment: The message text introducing the file in specified channels.
channels: Comma-separated list of channel names or IDs where the file will be shared.