I've just created a Boost child theme following the instructions at https://docs.moodle.org/dev/Creating_a_theme_based_on_boost and it is not shown in the Moodle's theme selector.
The permissions of the directories are correct (the same of the other themes) and I've already tried all the solutions of other forums. The problem is only related to child themes: if I add an "official" theme it is ok and visibile.
What can I do? My main goal is to have a child theme for changing css and other stuff without editing it via the Boost's SCSS web editor.
Thank you in advance,