Ensuring that all aspects of your guide - including the resources you link to - are accessible is valuable for the user experience. When possible, verify and note the accessibility of the documents and media you link to. If the linked resources are not accessible (e.g., a video does not have captions), consider using a different resources.
It's important to choose media with captions and transcripts. When embedding that media:
If your chosen content doesn't have captions, consider reaching out to the host and asking them to add them or select a more accessible resource.
Additional, non-library created documents you link to should be accessible. In many cases, that means they should be in Word instead of a PDF. If you can only find a PDF version, add a statement that the document may not be accessible.