This is fixed on master.
It seems to be back again.
I did a plugin for who wants to keep files on AWS S3. It's good for who keeps the NodeBB on Heroku or others servers that have ephemeral filesystem.
I wanted to maintain compatibility with NodeBB 0.6.x and nodebb-plugin-s3-uploads doesnt worked for me.
I will need to increase some features like content access control in the next version.