# Upload asset (/api-reference/files/uploadAsset)

Upload an image asset (JPEG or PNG). Use the returned `client_id` as:

- `face_ref_file_id` on a signer to enable face verification, or
- the `value` of an `image` element placed on the document.


This page is generated from the OpenAPI specification — read /openapi.yaml for the full request/response schemas, examples, and error codes.