@a_5mith i have tried the both, i think.
I check and i notice my config option are not saved.
I can fill the address, http://iframely.custom.com/iframely or http://iframely.custom.com (i'm not sure) for example. I save the page. I reload nodebb, the page, clean the cache. My config is still saved.
But when i came back a day later, in another session, the page is still empty.
Could it be a problem wth the plugin install?
 i confirm the config is not save. I don't have the notification. how can i check the database to verify if the configuration was solved?