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You can use the Admin SDK to put a file on Firebase Storage by following these steps:

1. Initialize the Admin SDK with your Firebase project configuration using the following code:

   const admin = require('firebase-admin');
   
   const serviceAccount = require('path/to/serviceAccountKey.json');
   
   admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    storageBucket: 'your-bucket-name.appspot.com',
   });
   

2. Use the bucket() method to obtain a reference to the Firebase Storage bucket:

   const bucket = admin.storage().bucket();
   

3. Use the upload() method on the bucket reference to upload the file to Firebase Storage:

   const filename = 'path/to/local/file.ext';
   const options = {
    destination: 'path/to/remote/file.ext',
   };
   
   await bucket.upload(filename, options);
   

   Note that the upload() method returns a Promise that fulfills when the upload has completed successfully.

That's it! Your file should now be uploaded to Firebase Storage.