handle generated media files

in my plugin i have generated an file dynamic that i want to put into the users media

i can’t use

$filepath = $apk->Generate();

// Move the file to the blog_id dir
$wp_filetype = wp_check_filetype( basename( $filepath ), null );
$aFile["name"] = basename( $filepath );
$aFile["type"] = $wp_filetype;
$afile["tmp_name"] = $filepath;

$attach_id = media_handle_sideload( $aFile, $post_id, 'This is optional file title' );

wp_redirect($_POST['_wp_http_referer']);

$wp_filetype returns two empty keys
and media_handle_sideload result to an empty blank site