Feature request: allow custom file URL in Gutenberg block

[RavanH]

Hi, great plugin! Easy to use and very practical. Only thing: we are forced to use the short code because the block will not allow us to embed PDF files that are in a custom (ftp) directory.

Not a big issue because it works very well with the short code, but it might be an idea for improvement?

And maybe... an option to hide the Bookmark icon on the right... or allow custom CSS for the iframe via a style="..." shortcode parameter?