Dear @skolisetti,
As per Model Driven App, each record will have each Documents Available in SharePoint. So Based on Respective Record we can see the respective Records from Sharepoint. (If you open the record --> Click On Related --> Documents)
Before Proceeding this Make Sure Document enabled for that Entity (Settings --> Document Management --> Document--> Document management Settings --> Input the URL if not exits and select the Entity)
To get Better understanding, do you want to show the same document for all the Users in the Record or Dashboard ?
if it is in Dashboard --> Settings --> Customization --> Customize the system --> New Dashboard --> Click on IFRAME and input the URL
If it is in Form Create a HTML Page and populate the Sharepoint List for all the Record
Go to settings --> Customization --> Customize the System --> Expand Entities --> Click On Form --> Open the Form --> Click Insert --> Click Iframe --> then add a url
Please mark as Answer if it is helpful and provide Kudos
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