You're seeing just the function
add, go back to Slack.Web.Files.Comments module for more information.
Add a comment to an existing file.
comment- Text of the comment to add. ex:
Everyone should take a moment to read this file.
file- File to add a comment to. ex:
Errors the API can return:
file_deleted- The requested file was previously deleted.
file_not_found- The requested file could not be found.
commentfield was empty.