I am wanting to add a reference to an external/3rd party PDF datasheet with more information on a Medication resource, am I best to add this as an extension with the Url of the extension pointing to the "home page" for the datasheets, and a valueString of the URL of the PDF (the PDFs are not currently available via an API).
For example, if I wanted to reference the PDF available at the following: https://www.medicines.org.uk/emc/files/pil.9845.pdf
I'd set the Url = https://www.medicines.org.uk/emc/ and the valueString = https://www.medicines.org.uk/emc/files/pil.9845.pdf