Thanks @inikolova
That helps.
Only thing I noticed was the render does not seem to output all my lighting (I'm using Spotlight).
In ordinary rendering in the main window, or as a Viewport, the render comes out fine - I'm currently using the Realistic Interior Final Renderwork style that comes with VW. Furthermore I'm often using Lit Fog on the RW BG in order to achieve some effects I'm after.
Outputting to PDF via Cloud does not seem to achieve this quality, only a kind've basic OpenGL looking effect.
Furthermore, I run into a similar issue after re-opening my document.
A fix I've found is selecting all my lights via the Viz pallete, and turning them off and on again. I'm then able to render using the desired RW style, however as mentioned no such luck outputting via Cloud PDF.
Any pointers in this regard that seem obvious?
Hope you're well and thanks for the response above.
Matt