diff --git a/lambdas/bedrock_invoker_2/src/index.py b/lambdas/bedrock_invoker_2/src/index.py
index 22475ff..0fc177f 100644
--- a/lambdas/bedrock_invoker_2/src/index.py
+++ b/lambdas/bedrock_invoker_2/src/index.py
@@ -22,7 +22,7 @@ def lambda_handler(event, context):
 
     for s3_uri in s3_uris:
         bucket, key = s3_uri.replace("s3://", "").split('/', 1)
-        extension = os.path.splitext(key)[1]
+        extension = os.path.splitext(key)[1].lower()
 
         try:
             print(f"Fetching file bucket: {bucket}, key: {key}")
@@ -36,7 +36,7 @@ def lambda_handler(event, context):
             elif extension in ['.jpg', '.png', '.jpeg']:
                 image_data = s3_object['Body'].read()
                 encoded_image_data = base64.b64encode(image_data).decode()
-                media_type = f'image/{'png' if extension == '.png' else 'jpeg'}'
+                media_type = f"image/{'png' if extension == '.png' else 'jpeg'}"
                 user_prompt_content.append({
                     'type': 'image',
                     'source': {'type': 'base64', 'data': encoded_image_data, 'media_type': media_type}