For the Oracle Apex Application Process example, I would like to refer my two previous posts in which I have given the Application Process examples to download a CSV file and to display BLOB contents (PDF and Images) in a region using the application process in Oracle Apex.
The following are the links for the same:
In this tutorial, you will learn how to download a CSV file using the PL/SQL code created in the Application Process (Ajax Callback) in Oracle Apex. The CSV file will be directly downloaded on a click of the button.
I hope with these two tutorials you will be able to create the Application Process in Oracle Apex for your needs.