Type '{ endpoint: string; metadata: { assembly_url: string; fieldname: string; filename: string; }; uploadSize: number | undefined; onError: (reason?: any) => void; onProgress: (bytesUploaded: number) => void; onSuccess: (value: void | PromiseLike<...>) => void; }' is not assignable to type 'UploadOptions' with 'exactOptionalPropertyTypes: true'. Consider adding 'undefined' to the types of the target's properties.