diff --git a/types.ts b/types.ts
index b70dd56..8bfc21d 100644
--- a/types.ts
+++ b/types.ts
@@ -87,6 +87,7 @@ export interface ChatMessage {
   role: 'user' | 'assistant' | 'system';
   content: string;
   timestamp: string;
+  attachments?: Attachment[]; // New: attachments inside chat messages
 }
 
 export interface SurveyResult {
@@ -143,6 +144,10 @@ export interface FeatureConfig {
   aiKnowledgeAgentEnabled: boolean;
   maxAiGeneratedArticles: number;
   maxAgents: number;
+  // Attachment Config
+  attachmentsEnabled: boolean;
+  maxFileSizeMb: number;
+  allowedFileTypes: string; // Comma separated string e.g. "jpg,png,pdf"
 }
 
 export enum AiProvider {