diff --git a/modules/shared_resources/lambda.tf b/modules/shared_resources/lambda.tf
index e6248e3..94420a8 100644
--- a/modules/shared_resources/lambda.tf
+++ b/modules/shared_resources/lambda.tf
@@ -68,7 +68,7 @@ resource "aws_s3_bucket_notification" "bucket_notification" {
   lambda_function {
     lambda_function_arn = aws_lambda_function.thumbnail_generating_func.arn
     events              = ["s3:ObjectCreated:Put"]
-    filter_prefix       = "chat/images/"
+    filter_prefix       = "chat/files/"
   }
 
   depends_on = [
diff --git a/modules/shared_resources/src/thumbnail/index.js b/modules/shared_resources/src/thumbnail/index.js
index b5cfc5b..fed4a9d 100644
--- a/modules/shared_resources/src/thumbnail/index.js
+++ b/modules/shared_resources/src/thumbnail/index.js
@@ -14,10 +14,10 @@ export const handler = async (event) => {
 
         console.log(`Processing file: ${key} from bucket: ${bucket}`);
 
-        // chat/images/ 폴더의 이미지 파일만 처리
-        if (!key.startsWith('chat/images/')) {
-            console.log('Not a chat image, skipping');
-            return { statusCode: 200, body: 'Not a chat image' };
+        // chat/files/ 폴더의 이미지 파일만 처리
+        if (!key.startsWith('chat/files/')) {
+            console.log('Not a chat file, skipping');
+            return { statusCode: 200, body: 'Not a chat file' };
         }
 
         // 이미지 파일 확장자 확인