[Feature Request]: add document upload api

[WaterWei]

Is there an existing issue for the same feature request?

• I have checked the existing issues.

Is your feature request related to a problem?

I have a lot of documents need to upload, and the webpage upload experience doesn't feel good enough.

Describe the feature you'd like

I hope to expose an upload API for me, so that I can use a python script to upload.

Describe implementation you've considered

No response

Documentation, adoption, use case

No response

Additional information

No response

[JinHai-CN]

Supported now.