diff --git a/lib/4nk/models/FolderData.ts b/lib/4nk/models/FolderData.ts
index f5a2aec..a02f612 100644
--- a/lib/4nk/models/FolderData.ts
+++ b/lib/4nk/models/FolderData.ts
@@ -1,5 +1,14 @@
 import type { RoleDefinition } from "./Roles";
 
+export interface AttachedFile {
+  id: string;
+  name: string;
+  type: string; // MIME type
+  size: number; // taille en bytes
+  base64Data: string; // contenu du fichier en base64
+  uploadedAt: string; // timestamp ISO
+}
+
 export interface FolderData {
   folderNumber: string;
   name: string;
@@ -9,6 +18,7 @@ export interface FolderData {
   notes: string[];
   messages: string[];
   messages_owner: string[];
+  attachedFiles?: AttachedFile[];
 }
 
 export function isFolderData(data: any): data is FolderData {
@@ -43,6 +53,7 @@ const emptyFolderData: FolderData = {
   notes: [],
   messages: [],
   messages_owner: [],
+  attachedFiles: [],
 };
 
 const folderDataFields: string[] = Object.keys(emptyFolderData);