Hey @acoustep thanks for this plugin, it's exactly what I need.
I did run into one issue where the content in the easymde editor is not saved when the entry in craft is not saved yet. If I first save an empty draft and then edit, it works.
Steps to reproduce
Create a easymde field in Craft. Make it required.
Create a new entry, fill in some markdown in the required field.
Hit save.
A validation error is triggered and the easymde field is empty.
I briefly looked into the code and am not sure why it wouldn't work when the entry is not yet persisted?
Iโve experienced this with many sites and plugins in recent years: stuff breaks because of changes or shutdown in external services. So for long-term-support Iโd expect the use of local assets to be a more futureproof solution.