Zoho Docs API

I currently am using using this method for uploading files:

https://www.zoho.com/projects/help/rest-api/documents-api.html#alink4

It has a message at the top of that page stating that the api is deprecated.

As of yesterday, it seems that I can no longer upload files via this method. The server replies with an empty array and no file is created.

Using the Zoho Docs API documentation I cannot determine how to upload documents to a specific project.

Does anyone have updated documentation or guidance?