Azure Storage - no storage

I'm trying to save images to storage, the whole process happens smoothly, until the time I'm going to look at the storage and:

This is my script

const blobSvc = azure.createBlobService(config.containerConnectionString);

    let filename = guid.raw().toString() + '.jpg';
    let rawdata = req.body.image;
    let matches = rawdata.match(/^data:([A-Za-z-+\/]+);base64,(.+)$/);
    if (matches) {
        var type = matches[1];
        var buffer = new Buffer(matches[2], 'base64');   
    }

    await blobSvc.createBlockBlobFromText('product-images', filename , buffer, {
        contentType:type
    }, function(error, result, response) {
        if (error) {
            filename = 'default-product.png';
            console.log(error);
        }else{
         console.log(result)
        }
    });

Does anyone know what's going on and how to solve it?