PDF Embedder stops working again

After my PDF plugin stopped working, I inserted the strings given at the page below. Following this, the PDF documents were displayed correctly.

https://wp-pdf.com/kb/using-caching-or-minifying-plugins/

However – this week, after updating a number of plugins (including Autoptimize), the PDF plugin stopped working AGAIN.

I repeated the steps above – but this time it did NOT fix the problem.

Can you please suggest what I should do.

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