Fixes
https://linear.app/chatwoot/issue/CW-5646/add-support-for-grouped-file-uploads-in-slack
Previously, when sending multiple attachments to Slack, we uploaded them
one by one. For example, sending 5 images would result in 5 separate
Slack messages. This created clutter and a poor user experience, since
Slack displayed each file as an individual message.
This PR updates the implementation to group all attachments from a
message and send them as a single Slack message. As a result,
attachments now appear together in one grouped block, providing a much
cleaner and more intuitive experience for users.
**Before:**
Each file uploaded as a separate Slack message.
<img width="400" height="800" alt="before"
src="https://github.com/user-attachments/assets/c8c7f666-549b-428f-bd19-c94e39ed2513"
/>
**After:**
All files from a single message grouped and displayed together in one
Slack message (similar to how Slack natively handles grouped uploads).
<img width="400" height="800" alt="after"
src="https://github.com/user-attachments/assets/0b1f22d5-4d37-4b84-905a-15e742317e72"
/>
**Changes**
- Upgraded Slack file upload implementation to use the new multiple
attachments API available in slack-ruby-client `v2.7.0`.
- Updated attachment handling to upload all files from a message in a
single API call.
- Enabled proper attachment grouping in Slack, ensuring related files
are presented together.
The Slack `files.upload` API endpoint is deprecated and will stop
functioning on March 11, 2025. In this PR, we have implemented the
changes for the [new file
upload](https://api.slack.com/messaging/files#uploading_files) method.
Skip calling the Slack file upload API for message types such as
fallback (e.g., Facebook and location messages) that lack actual file
data in attachments. This prevents unnecessary API calls and resolves a
Sentry error currently occurring in production.
fixes: https://github.com/chatwoot/chatwoot/issues/10460
