Our default rules don't allow for upload in CMS. In order to do this, you will need to update your Firestore Rules.

Open your FlutterFlow project and click Settings & Integrations > Firebase > Open Firebase Console

Next click Storage > Rules

Replace the code with the following and then click publish
​
rules_version = '2';
service firebase.storage{
match /b/{bucket}/o {
match /{allPaths=**} {
allow read, write: if request.auth != null;
}}
}

Important: We recommend reviewing your Firebase rules before deploying your app. Please see this link for additional information on Firestore security rules.