Having additional knowledge (RAG) to a custom Lumo and/or Project is really useful. One can add specific files/websites/documents for different types of custom Lumos or Projects.

As an example:
- custom Lumo acting as an expert for a product line - add the documentation for the product line as knowledge.
- custom Lumo acting as an expert in egovernment serivces - add the website of the egovernment services as knowledge
- a Project for personal finance - add invoices, or income reports as knowledge
- a Project related to planning an event - add offers, suggestions, plans as knowledge

At least the following types of knowledge should be available:
- Uploaded files (documents, text files, PDF files (with OCR option), images, etc.)
- URLs - websites, public repositories, etc. (to be re-fetched regularly, to be crawled for several levels (e.g. pointing to a github repo to index the content in the subfolders as well))
- Proton services (e.g. folder from Drive, the whole Device, Mail, Calendar)
- External apps / Connectors / MCP servers - e.g. Atlassian stack, other email and collaboration platforms, etc.
- Project specific - project content - once there are several chats in a project, they should be part of the knowledge available and used for new chats in the same project