Adding Files to Knowledge Collections API won't take an array of files

[jaipaddy]

I am trying to implement RAG with https://docs.openwebui.com/getting-started/api-endpoints/#adding-files-to-knowledge-collections but the API errors with 400 when trying to pass a list. I have 50K+ files (chunks) from an enterprise data source that I want to add as Knowledge. Multithreading in my code also errors with 400. If I can add only 1 file per call to the collection then I am afraid this is not at all useful. How would incremental updates to various files sync? Is this API going to be revamped? Also, why is there no documentation about the internal vector DB -storage and performance?