First, disable Gutenberg Shortcode Generator to enable Classic Editor. After enabling Classic Editor, Add New Pdf from PDF Poster Menu.
Enter a title, Configure, Copy the shortcode and update the post. Use the shortcode in Post, Page, or Widgets.
Sources
In Configure, add PDF sources from Link, Upload, Google Drive, or Dropbox.
Options
For the options of PDF Poster:
Set Width, Height, Jump to Page, and Zoom Level.
Show/hide Only PDF, File Name on top, Download button on top, View Fullscreen button on top, and Horizontal Scrollbar.
Enable/disable Allow Print, Google Doc Viewer, Open in a new window, Protect my content, Thumbnails toggle menu, and Load the last version of the pdf.
