ストアから以下のリジェクトをくらいました。
Guideline 5.1.1 - Legal - Privacy - Data Collection and Storage
We noticed that your app requests the user’s consent to access the camera and photos, but doesn’t sufficiently explain the use of the camera and photos in the purpose string.
To help users make informed decisions about how their data is used, all permission request alerts need to specify how your app will use the requested information.
Next Steps
Please revise the relevant purpose string in your app’s Info.plist file to specify why your app needs access to the user's camera and photos. Make sure the purpose string includes an example of how the user's data will be used.
You can modify your app's Info.plist file using the property list editor in Xcode.
原因と対策
下記ページを参考にImagePickerを導入してたのですが、
https://makulogsleep.com/flutter-image-store
下の部分をそのままInfo.plistに貼り付けてたら、「簡単すぎてわからんわ!」とお叱りを受けました。
タグの中身を、具体的に「画像データをどう使うのか」と書き直したらOKでした。