Hi,
Thanks for the instructions, they solved the problem!
The path you suggested allowed Download Manager to recognize my templates. However, as you mentioned in your note, a future update of the main theme will compromise them again.
Could you consider updating the plugin to also check the Child Theme directory (using get_stylesheet_directory() in addition to get_template_directory()) when searching for custom templates? This would prevent them from being deleted whenever the main theme is updated.
Thank you!