To demonstrate the functionality of the extension, a "PDF Storage" page was created where you can upload and view PDF documents. In addition, the "PDF Storage" action has been added to the Customer List and Customer Card. When adding documents through this action, all of them will be available on the factboxes of a specific Customer. It is pretty simple to implement that PDF viewer to any entity in Business Central. Since logics was written using RecordID, you need just connect factbox/action to any page in Business Central in a code.