Could it be that you added the All In One plugin as your last step? If so, although the process seems finished, it is not as the job as yet to be done by the Connect server. Only the Workflow process part is done.
Try adding your All In One plugin as an action and set the last step to be Delete. Then try again and you will see if the process complete properly.
Try it in Debug and put a breakpoint red bullet on the step right after your All In one plugin. Run your process and look at the PDF (View as PDF) from the top ribbon (usually it is located right under the Debug menu).
Then tell me what you see. If it is greyed out or errors out, then try the View as Text. If what you see is your input data file, then something went wrong while creating your PDF.
In that case, I suggest you open a technical support ticket on our website.
Cached version not available, attempting to upload file.
Create the rest client
W3001 : Error while executing plugin: HTTP/1.1 401 Unauthorized
All in One: W1603 : Plugin failed - 13:06:50 (elapsed time: 00:00:00:010)
I will do a search on the forum to find a solution thanks