Well... I get mixed results.
I have JMS_BROKER_MEMORY=300000000
When I upload a 254 MB file I see the progress bar working to 100% but when I click ok, system hangs.
When I upload a 55 MB file, all good. Progress Bar to 100% and clikcing ok is fine.
However,
Which I click the Document Control on the Form it views (or downloads) ok.
BUT, if I call it in a Process using DISPLAY Document, I get this error....

Note that the file is saved to the File System. Not the DB.