Shameless plug...

MatterMost was actually a great file sharing platform for our business. But they was not true open-source and removed features we needed like SSO.

So instead we vibe-coded a MatterMost Slack alternative which we have been running on the internet fine for months now https://intellistream-datahub.github.io/intellistream-chat/ Its super convenient to share files on. And it comes with built-in secret sharing like YoPass. We occasionally implement new features and fix bugs we discover.

Its one jar file, and supports Vault/OpenBao and requires Keycloak and PostgreSQL. Lucene is embedded.