There are two problems with including js and css files in widgets:
- Even when the files are correctly loaded there are errors in the log:
Could` not find resource file "/apps/dashboard/widgets/iframe/style.css"
Undefined offset: 0 at /var/www/html/nextcloud/lib/private/template/resourcelocator.php#119
- When apps are in a different directory than 'apps' the files are not loaded at all.
There are two problems with including js and css files in widgets: