Thank you for asking.
I’m afraid that this issue doesn’t relate with the Sydney theme. I thought there is a memory limit misconfiguration in your server.
In order to fix the issue, could you please try to do the following?
- Edit your wp-config.php file. Then add the following
- If you have access to your PHP.ini file, change the line in PHP.ini
If your line shows 32M try to increase it to 64M
memory_limit = 64M;
- If you don’t have an access to PHP.ini file, try adding this to the .htaccess file which resides in the root directory where the WordPress files installed
php_value memory_limit 64M
If none of them doesn’t seem to work, I’d strongly suggest you to contact your hosting support.
> What plugin do you recommend to add an Image Gallery where the users can upload images?
I thought Carousel by Jetpack is worth to try.