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
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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