files_upload() initial_comment isn't formatted (regression) when posting a Slack post about python-slack-sdk

[seratch]

Hi @belm0, we appreciate your time and effort in reporting this issue. We also apologize for any inconvenience caused by the changes in the platform's behavior.

Sometime between Oct 20 and Oct 25 2023, text supplied to initial_comment of files_upload() no longer gets formatted.

I tried to reproduce the same misbehavior on my end, but files.upload API call works for me without any issues. If you're still experiencing the same, could you please share a minimum working example for us to reproduce the issue?

The following test code does not include an example for usergroup mention but other syntaxes are working well:

import os
import unittest

from integration_tests.env_variable_names import SLACK_SDK_TEST_BOT_TOKEN, SLACK_SDK_TEST_WEB_TEST_CHANNEL_ID
from slack_sdk.web import WebClient


class TestWebClient(unittest.TestCase):
    """Runs integration tests with real Slack API

    https://github.com/slackapi/python-slack-sdk/issues/1429
    """

    def setUp(self):
        pass

    def tearDown(self):
        pass

    def test_initial_comment(self):
        token = os.environ[SLACK_SDK_TEST_BOT_TOKEN]
        channel = os.environ[SLACK_SDK_TEST_WEB_TEST_CHANNEL_ID]
        client: WebClient = WebClient(token=token)
        current_dir = os.path.dirname(__file__)
        file = f"{current_dir}/../../tests/data/slack_logo.png"
        v1 = client.files_upload(
            channels=[channel],
            file=file,
            filename="slack_logo.png",
            initial_comment=f"Here is the file for <#{channel}> <https://google.com|this is a link>"
        )

        v2 = client.files_upload_v2(
            channel=channel,
            file=file,
            filename="slack_logo.png",
            initial_comment=f"Here is the file for <#{channel}> <https://google.com|this is a link>"
        )

[belm0]

I see-- markdown should work OK for our case.

[belm0]

Thank you. The problem appears related to using the content option, and specifically with filetype='post'.

If I use content and filetype='markdown' then initial_comment is formatted as expected.

If I use content and filetype='post' then initial_comment is not formatted. (The file content itself is, however.)

        v1 = client.files_upload(
            channels=[channel],
            filename="file.md",
            content="content goes _here_",
            filetype='post',   # vs. 'markdown'
            initial_comment=f"Here is the file for <#{channel}> <https://google.com|this is a link>"
        )

[seratch]

Thanks for your prompt response!

Indeed, this seems to be a regression bug on the platform side. However, I hate say this... but Slack posts are now deprecated in favor of canvas, which is the one currently recommended to use: https://slack.com/help/articles/4426294050451-Slack-feature-retirements

So, please consider going with markdown or anything else that meets your requirements. Sorry for the disruption but I hope this helps clarify what's going on.

[seratch]

Thank you very much for your understanding. Let me close this issue now.