Hi there, @Piero_Biasi1 
Thank you so much for the feedback!
We already have a request for the file attachment option, and I’ve added your comment there too. If this idea gets more votes, it might be considered in the future updates.
We also have a request for an option to embed another widgets into Blog. If this feature is released, you’ll be able to embed your PDFs using our PDF Embed widget.
You can upvote this idea here 
- HTML code block to embed other widgets