That's currently not possible.
The UI for FFC is web-based which precludes the workflow you mentioned below since the file has to be downloaded and opened in the local computer.
One thing to note - FFCore preflight is also able to apply any fixups defined in the preflight profile.
My customer used previously FF Process Manager and really appreciated at this time to use Preflight possibility in WF.
I mean Do a stop in WF, edit the PDF file, modify it, save it and resume.
Is there any possibility to do the same in FFCore WF ?
Thanks in advance