Hey guys, I have tried to find an answer

Hey guys, I have tried to find an answer to this but to no avail.
For some reason the S3 loader (eg: https://docs.llamaindex.ai/en/stable/examples/data_connectors/simple_directory_reader_remote_fs/)

Fails to load/parse pdf files from my S3 bucket, but suceeds on .txt files.
Did someone encounter a similar issue? Any help would be much appreciated!