Continue: more details about the Shared resources
In your resources course, you can add many files with 'Add resource' and set ONE as the main, see the screenshot:
In your local course, create a URL resources and link to the LINK above:
Set display as 'OPEN' and move this Activity far down to the bottom of page and make it orphaned.
Create a text your desired and hyperlink it to the LINK Activity to the LINK to resource, the URL to the LINK to LINK should look like: