NOTE: the latest version is 3.0.0
Files are used to upload documents that can be used with features like Fine-tuning.
See https://beta.openai.com/docs/api-reference/files
https://beta.openai.com/docs/api-reference/files/upload
https://beta.openai.com/docs/api-reference/files/retrieve
https://beta.openai.com/docs/api-reference/files/retrieve-content
https://beta.openai.com/docs/api-reference/files/list
https://beta.openai.com/docs/api-reference/files/delete
https://beta.openai.com/docs/api-reference/files/upload