Problem to get the right path

Hello,
1. I have a wp-multisite.
2. my images are at /public/pict_test/uploads and not at public/wp-content/uploads.

So I use and change this code:

add_filter( 'webpc_site_root', function( $path ) {
    return ABSPATH;
} );

add_filter( 'webpc_dir_name', function( $path, $directory ) {
    if ( $directory !== 'uploads' ) {
        return $path;
    }
    return 'pict_test/uploads';
}, 10, 2 );

add_filter( 'webpc_dir_name', function( $path, $directory ) {
    if ( $directory !== 'webp' ) {
        return $path;
    }
    return 'pict_test/uploads-webpc';
}, 10, 2 );

add_filter( 'webpc_htaccess_rewrite_path', function( $prefix ) {
    return '/';
} );

The code adds this .htaccess to public/pict_test:

# BEGIN WebP Converter
# ! --- DO NOT EDIT PREVIOUS LINE --- !
<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{HTTP_ACCEPT} image/webp
  RewriteCond %{DOCUMENT_ROOT}/pict_test/uploads-webpc/$1.jpg.webp -f
  RewriteRule (.+)\.jpg$ /pict_test/uploads-webpc/$1.jpg.webp [NC,T=image/webp,L]
  RewriteCond %{HTTP_ACCEPT} image/webp
  RewriteCond %{DOCUMENT_ROOT}/pict_test/uploads-webpc/$1.jpeg.webp -f
  RewriteRule (.+)\.jpeg$ /pict_test/uploads-webpc/$1.jpeg.webp [NC,T=image/webp,L]
  RewriteCond %{HTTP_ACCEPT} image/webp
  RewriteCond %{DOCUMENT_ROOT}/pict_test/uploads-webpc/$1.png.webp -f
  RewriteRule (.+)\.png$ /pict_test/uploads-webpc/$1.png.webp [NC,T=image/webp,L]
</IfModule>
<IfModule mod_headers.c>
  <FilesMatch "(?i)\.(jpg|jpeg|png)(\.(webp|avif))?$">
    Header always set Cache-Control "private"
    Header append Vary "Accept"
  </FilesMatch>
</IfModule>
# ! --- DO NOT EDIT NEXT LINE --- !
# END WebP Converter

The code adds the folder public/pict_test/uploads-webpc
with this .htaccess:

# BEGIN WebP Converter
# ! --- DO NOT EDIT PREVIOUS LINE --- !
<IfModule mod_mime.c>
  AddType image/webp .webp
</IfModule>
<IfModule mod_expires.c>
  ExpiresActive On
  ExpiresByType image/webp "access plus 1 year"
</IfModule>
# ! --- DO NOT EDIT NEXT LINE --- !
# END WebP Converter

The problem is, the converted images are in this folder now:

/public/pict_test/uploads/wp-content/uploads-webpc/.../users/.../apps/.../public/pict_test/uploads/sites/23/2022/04

so,
1. with the full path and
2. not at public/pict_test/uploads-webpc, what I think is the right folder, or?

What did I do wrong?
Thanks