Use these snippets to load ACF JSON files from more than one directory
<?php
add_filter( 'acf/settings/load_json', function ( $paths ) {
$paths[] = get_template_directory() . '/some/custom/dir';
return $paths;
} );
<?php
add_filter( 'acf/settings/load_json', function ( $paths ) {
$paths[] = get_template_directory() . '/some/custom/dir';
$paths[] = WP_CONTENT_DIR . '/uploads/some/custom/dir';
$paths[] = '/some/system/path/dir';
return $paths;
} );