I'm using Acrobat DC (version 2019.010.20098 - auto updated by Creative Cloud).
I need to unembed the fonts from a PDF file that I exported from InDesign. I do this via File > Save As Other > Optimised PDF...
This has worked for me many times in the past years. But it doesn't seem to be working at all now. I'm doing it correctly (move fonts from left pane to right pane to unembed them), but it literally seems to be doing nothing. Opening the optimised file shows that the fonts (subsets) are still embedded within.
It does work, however, with other random PDFs I've tested. It's as if exporting from InDesign produces a PDF from which the fonts cannot be unembedded.
Can anyone shed any light?