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The issue you’re encountering with saving network-level snippets in your WordPress Multisite 6.3.1 instance appears to be related to the “Allow activation on individual sites” option. This option allows you to activate the snippet on individual sites within your multisite network.

It seems like you are able to save the snippet successfully when this option is unchecked but encounter an error when trying to save it with the option enabled. Additionally, if you edit the snippet and try to enable the option afterward, it still won’t save.

Here are some steps you can take to troubleshoot and potentially resolve this issue:

1. Plugin/Theme Conflict: Check if there’s a conflict with another plugin or your active theme. Deactivate all other plugins and switch to a default theme (e.g., Twenty Twenty-One) temporarily. Try creating/editing the snippet again with the option enabled to see if it saves. If it does, you can gradually reactivate your plugins and switch back to your theme to identify the conflicting one.
2. Update Everything: Ensure that your WordPress core, the Code Snippets plugin, and any other related plugins are up to date. Sometimes, compatibility issues are resolved in newer versions.
3. Check Server Logs: Examine your server error logs for any specific error messages related to the issue. The error message you provided doesn’t give much detail. Server logs can often provide more insight into the problem.
4. Memory Limit: It’s possible that the issue is related to PHP memory limits. Increase the PHP memory limit in your server’s PHP configuration or by adding the following line to your wp-config.php file:phpCopy codedefine('WP_MEMORY_LIMIT', '256M'); // Adjust the limit as needed
5. Plugin Support: Reach out to the support team for the Code Snippets plugin. They may have encountered this issue before and can provide specific guidance or a fix for your version.
6. WordPress Multisite Configuration: Ensure that your WordPress Multisite network is configured correctly. Check your network settings and verify that your network is functioning as expected.
7. Debug Mode: Enable WordPress debug mode by adding the following lines to your wp-config.php file:phpCopy codedefine('WP_DEBUG', true); define('WP_DEBUG_LOG', true); This will log any PHP errors to a debug.log file in your wp-content directory. Check this log for any errors related to saving network-level snippets.
8. Backup: Before making significant changes, always backup your WordPress site, including the database, so that you can restore it if something goes wrong.

By following these steps, you should be able to diagnose and potentially resolve the issue you’re facing with saving network-level snippets in your WordPress Multisite instance. If the problem persists, consider seeking assistance from the Code Snippets plugin’s support or the WordPress community forums, providing them with detailed information about your setup and the error messages you encounter.