Let me explain — Until now, I have been using NextGen Gallery, and since I have a redesigned website that has image.php template (gallery attachments page), I would like to use Wordpress' built-in gallery feature instead.
Here's the problem — I can't forever continue to monitor if NextGen Gallery plugin is working as intended on my website, even though my old posts still use it.
Considering that, I would like to import and convert all NextGen galleries into Wordpress galleries.
Is there a way to do this without all the hard work of having to upload gallery-by-gallery, post-by-post (I have close to 250 galleries!)?