How to import private channel from Slack (with history) into Mattermost? Do you know a Slack plugin that does a good export that Mattermost can import? I have found a Slack plugin from export.fountstudio.com which though, can't be imported well, most of the time it fails.
I was looking for a valid format of Mattermost message import but I can't find that either, and also I can't find any Mattermost export plugin to see correct format...
Any advices please?
From the Mattermost documentation:
Direct Messages and Private Channels cannot be imported. Slack does not include these messages when generating the export archive.
https://docs.mattermost.com/administration/migrating.html?highlight=slack#limitations