Update troubleshooting.md

docs/troubleshooting.md

@@ -3,4 +3,7 @@ Something went wrong, no matter, here are some suggested solution to common issu
 
 ### My urls are expiring too soon
 Presigned urls only last for a limited time, which has an upper bound by the type of identity used to create the url.
-* [Upper bound limits on expiry times](https://docs.aws.amazon.com/AmazonS3/latest/userguide/using-presigned-url.html#who-presigned-url)
+* [Upper bound limits on expiry times](https://docs.aws.amazon.com/AmazonS3/latest/userguide/using-presigned-url.html#who-presigned-url)
+
+### 403 Access Denied on requests
+Make sure to enable ACL under Object ownership on my bucket while having block public access off.