Luke Thompson
This approach is great one, especially when you have a document management system in place. The document management system could even be something as simple as an Amazon S3 bucket where documents get uploaded to.
You can build the URLs to link out to other systems using one of the fields in your dataset (such as a unique identifier), assuming your documents have a standard name convention. Here are some resources with information about configuring pop-ups to have hyperlinks.
Configure pop-ups - ArcGIS Pro
Using URL Parameters in pop-ups
Thanks,
Matt Ballard