For a version older than 4.3.6
You can avoid such problem by following the recommendations below:
- Do not upload more than 10 images simultaneously (we recommend to upload 3 - 5 images at a time).
- Use a standard WordPress media uploader (on the same page).
If you still get the same issue open your "wp-config.php" file (located in your WordPress theme root directory on your server) and replace this code
define('WP_DEBUG', false);
with
define('WP_DEBUG', true);
Then check if you get any errors (after upload and publishing).
This article related to Galley by BestWebSoft plugin
Additional resources: Gallery - User Guide
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