Client or secret key.

Uploads a file as multipart/form-data. Which key may upload it, and what is created, depends on asset_type:

Without asset_type the upload is an image, so a client key must name anchor-features or mesh; any other type answers 403 API_KEY_TYPE_NOT_ALLOWED. The MIME type is the file part's own Content-Type. When that is application/octet-stream and the asset_type does not accept it (image and video), the type is taken from the file name's extension instead: .jpg or .jpeg, .png, .gif, .webp, .mp4, .webm or .mov.

An anchor file's response gives a url to pass to a cloud or geospatial anchor as descriptors_url, feature_points_url or mesh_url. It is deleted with the anchor that references it, and after 24 hours if no anchor does. A file record's response gives an id to attach or link as user_asset_id; it is deleted 90 days after upload.

With a client key, project_id must be the key's project. Uploads are not counted against the monthly API request quota.