Hey Chris, here is a post about the file upload limits for Pickaxe.
As this post attempts to explain (but perhaps it’s not clear) all the Knowledge Base content gets vectorized. So it’s free to upload files into the Knowledge Base.
Generating answers is actually different. For each interaction, your Pickaxe will summon forth the 750 most relevant tokens from the vectorized Knowledge Base. These 750 tokens are inserted into the context window, and thus paid for. This ‘750 token’ number is adjustable within the “Learn” tab of the builder.