Scheduling a post is already a feature in wordpress, and if you check the onesignal checkbox in every single post page (Send notification on POST_NAME publish), it will send a notification when the post is published with its featured image.
Forgive me, I wasn’t clear:
Currently, the one-signal metabox doesnt have a schedule feature. But your plugin does.
So Im asking if you can modify /wp-admin/admin.php?page=oss_send_notifications to select from any pre-existing page/post and schedule the date/time to send (and include its featured image, and include the posts url as the click destination)
Thank you sir