MissingSourceFilter thrown when attempting file_search.msearch

I have a thread within a project and that thread has 70 PDFs uploaded. I specified in that thread that I only want it to base it’s answers on those PDFs.

Every time the thread attempts to search through the PDFs using file_search.msearch, it is receiving the following error from it’s backend:

Missing source_filter. source_filter must be a non-empty list[str] of valid source names. Available sources: files_uploaded_in_conversation

It’s then telling me that it’s exposed schema does not allow it to add a source_filter, saying that the only available parameters are

{

“queries”: [“…”],

“intent”: “…”,

“time_frame_filter”: { … }

}