Hello Stefano,
in the plugin in “Theme Options”, it says: “Custom themes are stored on wp-content/plugins/newsletter-custom/themes-feed.”
We upgraded from Newsletter Pro to Newsletter and we are not seeing our custom feed themes stored in wp-content/plugins/newsletter-custom/themes-feed/.
I checked the source code and it appears that you load these themes only from wp-content/extensions/newsletter/feed/themes and that it not good because of possible extension upgrades.
Could you please let us know how to work with this?
Thanks,
Martin