EndNote Click (former known as Kopernio) is a browser extension that can help users find PDFs of academic journal articles through our subscription, Open Access versions in preprints repositories or institutional repositories.
You will set up an EndNote Click account, which is a different account from your EndNote online account. In your EndNote Click Locker, you can "push" the reference into your EndNote online account.
However, LibKey Nomad is a similar tool that the University Libraries subscribes to. It works on campus or off campus and no account is required. After all, you can download a reference as a RIS file, then import it into your EndNote online account on most academic publisher's websites.