As soon as is possible after the user has selected "Yes" on the image inspector, an onboarding dialog should appear. This should appear even as the image preview loads and the image inspector animates away, if possible.
* Dialog should display every time the user comes to this step until they select the "don't show this again" checkbox.
* Header with contents TBD.
* Body TBD.
* "Don't show this again" checkbox is at the bottom of the dialog. After the user selects, they should not see this dialog when they arrive at the caption step in the future.
* A single button at the bottom dismisses the dialog: "Got it".
* This dialog also appears when the user taps the "?" icon while doing the task. In this case, the "Don't show this again" checkbox is not present.
//Mockup as of 2021-10-08:// {F34680277}
Figma: https://www.figma.com/file/ULhJr1isDstRbGE5vjYDsr/Add-images-structured-task?node-id=3014%3A8599