Automatic upload of documents in feeds and comments

Automatic upload of documents in feeds and comments

I was quite sure that in the past when I upload a document in a comments I always found it in the docs list of the project.
Recently I have the impression is not working anymore like that. Is something changed. 

In the feeds I never had it to work.

Am I wrong?

So what's the right procedure. Should I always first upload in the documents and the associate it to task comments and feeds?

Tghank for the help and sorry for my english....... I hope it is understanable.