It’s not clear from the .htaccess files you’ve posted why you can’t access files/folders outside of your WordPress installation (inside the /websiteWP subdirectory). In fact, you shouldn’t need to add specific exceptions in order to access physical files, since these directives shouldn’t apply to physical files.
However, your .htaccess files are misconfigured…
If the WordPress installation is in /websiteWP directory then the /websiteWP/.htaccess file (in the route of your WordPress installation) is incorrect, as it is routing all requests to /index.php – that’s the index.php file in the document root (which I assume is the parent directory), not the WordPress front-controller which should be in the same directory, ie. /websiteWP/index.php).
However, I assume /index.php (in the document root) doesn’t exist (otherwise your WordPress site won’t work). The .htaccess directives in the root .htaccess file are then rewriting the request back to the /websiteWP/index.php WordPress front-controller! This is extra work and unnecessary.
You should change the /websiteWP/.htaccess file to read:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
</IfModule>
Note I have removed the RewriteBase directive and removed the slash prefix on the RewriteRule susbstitution, changing /index.php (root-relative) to index.php (relative).
Then, the root .htaccess file is not required at all.