Meteor-CollectionFS upload files using the method on the server side

Hello and looking for any information on how to upload files using the method on the server side and whether it is possible.

My knowledge is small. I have a server-side method that saves that “Article” in the database, for this article I would like to attach files. At this time, upload the files on the client side, and “article” on the server side. I do not know how to tie together the article and attached files