Thanks for the information. That sounds very ugly.
I was thinking about using the pyto xcallback to create python augmented/powered Drafts actions.
Or even calling mdpre or md2pptx from @martinpacker. python-pptx installed fine.
If pyto is buggy I might have a look inside the source code on github.
It is sad that all Python options seem to get or stay worse.
Maybe the external RasberryPi as a python server is the best approach for today.
@drdrang Did your file or folder structure had any special structure? Like same file names in different folders?