Unable to save flipbook settings / unable to add new flipbook
Increase max_input_vars in your php.ini from default 1000 to higher value, for example 3000 and restart server. If you don’t find max_input_vars in your php.ini file then add it like this
max_input_vars=3000save and restart server.
Make sure that max_input_vars in not commented out with semicolon at the beginning of the line like this