Below is the list of parameters allowed as the upload parameters of an unsigned upload:
- upload_preset (Mandatory).
- face_coordinates (image only).
- custom_coordinates (image only).
Additionally, although the
public_id parameter can be specified, the
overwrite parameter is always set to 'false' for unsigned uploads to prevent overwriting existing files.
Few more functionalities are available via the upload-preset (use original filename, control backup policy, perform moderation, etc.).
Note that unsigned upload parameters cannot contradict the upload-preset settings.