I have created a small tutorial video to describe the simplest configurations of ERAttachment framework. Hopefully once you get your feet wet, the additional configurations possible won't be so daunting. See the Official ERAttachment Package Summary/Overview
The tutorial video refers to the following application that demonstrates how to use the ERAttachment Framework to store a Person entity's photo.
Using ERAttachment with ERModernLook (ERD2W)
There are a few notes on using D2W components with ERAttachment on this page:
Oracle and ERAttachment Table Creation