separate download url from preview url

index.html

@@ -3176,7 +3176,7 @@
         if (this.props.mimeType === Drafty.getContentType()) {
           Drafty.attachments(content, function(att, i) {
             attachments.push(<Message.Attachment
-              filename={att.name} blobUrl={Drafty.getBlobUrl(att)}
+              filename={att.name} downloadUrl={Drafty.getDownloadUrl(att)}
               size={Drafty.getEntitySize(att)} key={i} />);
           }, this);
           content = React.createElement('span', null, Drafty.format(content, formatter, this));
@@ -3283,7 +3283,7 @@
               {this.props.uploader ?
                 <FileUploadProgress progress={this.props.progress} />
                 :
-                <div><a href={this.props.blobUrl} download={this.props.filename}>
+                <div><a href={this.props.downloadUrl} download={this.props.filename}>
                   <i className="material-icons">file_download</i> save
                 </a></div>
               }