In the article's demonstration, after the instructor uploaded the fee structure document and tested by asking about the refund policy, the system returned that the dataset did not contain relevant information; investigation found that the chunking result was inconsistent with expectations (the 72 chunks had not changed), and that retrieval pointed to the wrong vector store; after rebuilding the Pinecone index and reloading the fee structure document, 13 chunks were written successfully, and the specific refund policy clauses were retrieved (including the different handling for cancellation before the project starts and cancellation within 30 days).