/**
 * Uploads staged attachments (`{ file, attachmentType }`) for a transaction.
 * The upload endpoint takes one attachment type per request, so files are
 * grouped by type and sent as one request per group, all in parallel.
 *
 * Never rejects when a group fails. It resolves with the files that did
 * upload and the ones that did not, so a caller can drop only what landed
 * and leave the rest staged; rejecting as a whole would make a retry send an
 * already-uploaded group a second time and duplicate those attachments.
 *
 * @returns {Promise<{uploaded: File[], failed: File[], error: unknown}>}
 */
export declare const uploadTransactionAttachments: (transactionId: any, attachments: any) => Promise<{
    uploaded: File[];
    failed: File[];
    error: unknown;
}>;
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