ACF file Upload to Seperate Folder

functions.php

<?php
// ACF upload prefilter
function acf_upload_dir_prefilter($errors, $file, $field) {
	$upload_dir = wp_upload_dir();
     // only allow admin
    if( !current_user_can('manage_options') ) {
        $errors[] = 'Only administrators may upload attachments';
    }
    $_filter = false;
    // This filter changes directory just for item being uploaded
    add_filter( 'upload_dir', 'my_custom_upload_directory' );
    // return
    return $errors;
}
// ACF hook, set to field key of your file upload field
add_filter('acf/upload_prefilter/name=specs_sheet_file', 'acf_upload_dir_prefilter');
// acf custom file upload directory

function my_custom_upload_directory( $param ) {
	$folder = '/acf_attached_file';

	$param['path'] = $param['basedir'] . $folder;
	$param['url'] = $param['baseurl'] . $folder;
	$param['subdir'] = '/';

	return $param;

}