Yes! All perfect. Thanks!
is it possible to index a custom directory an the webserver?
Currently, the plugin works with the database, not with the physical location of the files. Actually, it does not matter where the file is stored - it will index all the files that are in WP Media Library.
So the best way to index the folder with files - just to upload these files into the WP Media Library. Is it a problem to do that with your app?