class_docstr: Send a file to a Slack channel.
  
  .. code-block:: python
  
      # Send file with filename and filetype
      slack_operator_file = SlackAPIFileOperator(
          task_id="slack_file_upload_1",
          dag=dag,
          slack_conn_id="slack",
          channels="#general,#random",
          initial_comment="Hello World!",
          filename="/files/dags/test.txt",
          filetype="txt",
      )
  
      # Send file content
      slack_operator_file_content = SlackAPIFileOperator(
          task_id="slack_file_upload_2",
          dag=dag,
          slack_conn_id="slack",
          channels="#general",
          initial_comment="Hello World!",
          content="file content in txt",
      )
  
  :param channels: Comma-separated list of channel names or IDs where the file will be shared.
      If set this argument to None, then file will send to associated workspace. (templated)
  :param initial_comment: message to send to slack. (templated)
  :param filename: name of the file (templated)
  :param filetype: slack filetype. (templated) See: https://api.slack.com/types/file#file_types
  :param content: file content. (templated)
  :param title: title of file. (templated)
  :param channel: (deprecated) channel in which to sent file on slack name
code: def execute(self, **kwargs):
      self.hook.send_file(
          channels=self.channels,
          # For historical reason SlackAPIFileOperator use filename as reference to file
          file=self.filename,
          content=self.content,
          initial_comment=self.initial_comment,
          title=self.title,
      )
  
imports: from __future__ import annotations
  import json
  import warnings
  from functools import cached_property
  from typing import TYPE_CHECKING, Any, Sequence
  from airflow.exceptions import AirflowProviderDeprecationWarning
  from airflow.models import BaseOperator
  from airflow.providers.slack.hooks.slack import SlackHook
label_desc: Use image node_id 2 for calling the SlackAPIFileOperator obj's underlying member method code with example usage: obj.execute() without return types