Anyone else having trouble with ePro Fluid pages and File Attach?

FSCM 9.2.38

Ptools 8.57.21

We are trying to upgrade to FLUID from Classic for eProcurement.

Having trouble getting enough information from Trace files to find out what is happening. On the File Attach page, when I click 'Done' button, the page will spin and spin, and there is a pop up error message 'xml is invalid'.

Let me back up, - the File Attach page is called from the delivered Add_Attachment function in FILE_ATTACH_WRK.AttachAdd.FieldChange. However, full disclosure, I have added a custom link to the page to call that File Attach functionality.

But if my Trace file would show HOW I got that XML is invalid message, it would help a lot. I've used 4044 and 4060 in PeopleCode trace and 23 in SQL trace.