/**
 * Upload file(s) to the backend
 * @param files
 * @param insightId
 * @param projectId
 * @param path
 * @returns
 */
export declare const upload: (files: File | File[], insightId: string | null, projectId: string | null, path: string) => Promise<{
    fileName: string;
    fileLocation: string;
}[]>;
/**
 * Download a file by using a unique key
 *
 * @param insightId - insightId to download the file
 * @param fileKey - id for the file to download
 */
export declare const download: (insightId: string, fileKey: string) => Promise<void | ArrayBuffer>;