## TL;DR

For "bash Python 3.10.8 ProductName: macOS ProductVersion: 13.3.1 BuildVersion: 22E261 Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:17 PST 2023;": [seratch (contributor)]: files_upload_v2 failures on slack-sdk 3.19.4 were caused by server-side changes; upgrade to 3.20.1 or newer. The reporter confirmed the upgrade fixes it.

```text
bash Python 3.10.8 ProductName: macOS ProductVersion: 13.3.1 BuildVersion: 22E261 Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:17 PST 2023; root:xnu-8796.101.5~3/RELEASE_X86_64
```

## Steps

1. [seratch (contributor)]: files_upload_v2 failures on slack-sdk 3.19.4 were caused by server-side changes; upgrade to 3.20.1 or newer. The reporter confirmed the upgrade fixes it.

## When to use

You are seeing this: Issue slackapi/python-slack-sdk#1359 (closed, 13 comments): ### Reproducible in: ``bash Python 3.10.8 ProductName: macOS ProductVersion: 13.3.1 BuildVersion: 22E261 Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:17 PST 2023;... Use this skill when you run into "Files_upload_v2 channel_not_found error, when chat_postMessage succeeds".

## When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

## Versions

Versions mentioned in the source: Python 3.10.8, ProductVersion 13.3.1, 22.4.0, rootxnu- 8796.101.5, slack-sdk 3.19.4, 3.20.1. If you are on something much newer or older, the details may have shifted.

## Variants

Other phrasings of the same problem that show up in reports:

### ``bash Python 3.10.8 ProductName: macOS ProductVersion: 13.3.1 BuildVersion: 22E261 Darwin Kernel Version 22.4.0: Mon Ma

```text
```bash Python 3.10.8 ProductName: macOS ProductVersion: 13.3.1 BuildVersion: 22E261 Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:17 PST 2023; root:xnu-8796.101.5~3/RELEASE_X86_64 ```
```

## Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

## Sources

- https://github.com/slackapi/python-slack-sdk/issues/1359