Attachment in Oracle PCS without CEC

Summary

Attachment in Oracle PCS without CEC

Content

We have had an on-premise application where user uploads an excel in an ADF form and it performs validation by parsing and calling PLSQL and throws back any error if its functionally wrong.  If successful, it creates entries in staging table which will trigger BPM workflow.

The question here is w.r.t Oracle PCS, how do we design this? We don't want this file to be stored in any CEC. 

1) Should we create the form with this functionality using ADF and deploy it in JCS and trigger PCS Workflow ?  But we need to buy then extra license for JCS along with PCS?