The default notification payloads for Slack are very out of date and recovery payloads cannot be edited at all. This means notifications sent to Slack have an unavoidably poor experience.
The current template has several issues which should be changed:
- Slack has labled the "attachments" API as legacy functionality and explicitly recommends using the Block Kit API instead. [source]
- Sharing a message posted using the default template simply embeds the message into a new message, rather than posting a link to the message
- I can only assume this is because the contents of the message are "attachments"