You should be able to do this by enabling Allow users to upload regular files in the ACP, and leaving the allowed extension list empty, or just putting in the extensions you want to allow.
I hope that you do realise that allowing all file extensions is rather dangerous without extra precautions.
Leaving the allowed extensions list empty is something I would strongly advise against.
ok, it's working now. But can we attach any file type like .docx or .txt in a post ? I think there will be a button upload appear when I installed s3-uploads but no
There's the Q&A plugin, which allows you to mark a post as the "answer". The integration to reward reputation for answering a question, I don't think we have yet, but it could be added to the Q&A plugin so you can configure rewards with it.
