Hi AC
Welcome to Microsoft Q&A Forum, thank you for posting your query here!
I understand that you are encountering an issue, File Upload is already there in chat playground. You can use the 'add your own data' feature in OpenAI chat playground to interact with your files. The files will be indexed using AI Search Basic Tier or higher tier. These indexes will then be queried from the vector store and communicated to OpenAI.
please refer the screenshot:
Kindly refer below documentation: openai
Thank You.