Undocumented: bucket upload return JSON

[sunarch]

The documentation shows in the example at https://developers.zenodo.org/#quickstart-upload that a JSON object is returned for uploads with the new files API, but the details of this object are not documented:

{
  "key": "my-file.zip",
  "mimetype": "application/zip",
  "checksum": "md5:2942bfabb3d05332b66eb128e0842cff",
  "version_id": "38a724d3-40f1-4b27-b236-ed2e43200f85",
  "size": 13264,
  "created": "2020-02-26T14:20:53.805734+00:00",
  "updated": "2020-02-26T14:20:53.811817+00:00",
  "links": {
    "self": "https://zenodo.org/api/files/44cc40bc-50fd-4107-b347-00838c79f4c1/dummy_example.pdf",
    "version": "https://zenodo.org/api/files/44cc40bc-50fd-4107-b347-00838c79f4c1/dummy_example.pdf?versionId=38a724d3-40f1-4b27-b236-ed2e43200f85",
    "uploads": "https://zenodo.org/api/files/44cc40bc-50fd-4107-b347-00838c79f4c1/dummy_example.pdf?uploads"
  },
  "is_head": true,
  "delete_marker": false
}

Specifically, the "links" part contains an "uploads" link, thad doesn't show up in the deposition files - retrieve object, and returns a 405 Method Not Allowed error for GET requests. See also zenodo/zenodo#2278