How do I save a push notification to the Message Inbox? I can't find the 'Save to Inbox' option in my preset settings.

Save to Inbox keeps a copy of your push in the app's inbox when you send it. Users still get the push banner, and can find the same message in the inbox later. The option is a toggle in the sending form, not in the preset itself:

• One-time push: go to Campaigns > One-time messages, start a one-time push, and on the Content step turn on Save message to Inbox. The inbox title and message come from the push preset.
• Customer Journey: select the Push element on the canvas and turn on Save to inbox in its settings.
• API: in a /createMessage request, add inbox_date and/or inbox_image. The message is saved to the Inbox when at least one of them is present.

After you turn the toggle on, set:

• Remove from Inbox: a number of days or a specific date. The maximum is 30 days.
• Message icon: an icon URL; if empty, the default icon is used.
• Action when inbox clicked: Use the action you set in the push content, or Open in-app banner with a Rich media you select.

Message Inbox must be set up in the app by your developers first. To send an inbox message without a push, use App Inbox instead.

Learn more: Save a push to Inbox