How to set Bytes data in firebase using flutter?

Cloud Firestore raw bytes is represented by Blob in Dart, so use:

    .setData({'thumbnailPhoto', Blob(await file.readAsBytes())});

When you read this back from Cloud Firestore you'll get back a Blob. Access its bytes with blob.bytes. For example, to write to a file use:

  await file.writeAsBytes(theBlob.bytes); // overwrite or create the file

In this case, you can convert the image to base64 string.

open image as:

var imageFile = File(imagePath);

convert to base64:

String base64Image = base64Encode(imageFile.readAsBytesSync());

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