If you want to share an article from one of the library's databases or electronic journals, don't download it from the database and upload it to the LMS... Link to it. If you like it, link it!
For most of the library's databases and electronic journals, you can just cut and paste the URL of the document from your web browser:
However, for databases from EBSCO, ProQuest, JSTOR, HeinOnline, and CQ Researcher, you must find the Persistent URL (aka: permalink or stable URL) for the article you want to share.