wp_upload_bits – unable to upload files due to a permissions issue

The wp_upload_bits function in WordPress is used to upload a file to the server, but it can sometimes fail due to a permissions issue. If you are facing an issue uploading files using this function, here are a few steps you can try to resolve the issue:

1. Check the folder permissions: The wp_upload_bits function uploads the file to the wp-content/uploads folder by default. Ensure that the folder has the correct permissions set, i.e. 755 or 775. You can check the folder permissions using an FTP client or cPanel.
2. Set the correct ownership: The folder may be owned by a different user than the user running the PHP script. Ensure that the folder is owned by the correct user or set it to the correct owner using the chown command.
3. Check the PHP max upload size: The maximum file upload size may be limited in your PHP configuration. You can check the value of upload_max_filesize in your php.ini file and increase it if necessary.
4. Check the WordPress max upload size: The maximum file upload size may also be limited in the WordPress configuration. You can check the value of MAX_UPLOAD_SIZE in the wp-config.php file and increase it if necessary.
5. Disable security plugins: If you have any security plugins installed, try disabling them temporarily to see if they are causing the issue. Some security plugins may restrict file uploads for security reasons.

If you have tried all of the above steps and are still unable to upload files, you can reach out to your hosting provider for further assistance.