Ok, ok, if you absolutely must have copies of the same file living in different libraries in SharePoint, this post will show how you’d manage that. Keep in mind, you’ll have to maintain the updates which means you’ll need to remember that there are copies out there and you’ll need to follow the steps below to push the changes out to the other copies.
First, select the document that you want copies of and go to More > Properties
Next, click Manage Copies in the ribbon
Click the New Copy button
You’ll then get to a page that lets you specify the destination library and you can change the name of the file if you’d like.
You’ll then see a confirmation page. Click OK
Now your documents are linked and if you make a change to the source, you can update the copies by following the same steps as above and instead of clicking New Copy, you’ll click Update Copies (screenshot #3). That will take you to a page that will let you select which files you wish to update.