Open Brand Context, then Knowledge base. Adding material is part of the paid plans.

To upload files: choose Upload files and pick one or more files. Supported types are PDF, Word (.docx), text, Markdown and CSV, up to 10 MB each. A project can hold up to 20 files and 100 MB of files.

To paste text: choose Paste text, give it a name such as "Refund policy", paste the text (up to 50,000 characters) and choose Add to knowledge base.

Each item shows its type, size and date. Choose Still true once you have checked an item; items not confirmed for about three months show Due for a look. An uploaded file can be downloaded again from its row, and any item can be deleted.