Problem with file path

[esedic]

Hi!

I suppose it's not a real issue with a library.

I'm using this library in Wordpress theme together with Advanced Custom Fields 'File' field type.
I'm having trouble with file path, I can get from ACF either URL path 'https://www.mydomain.com/wp-content/uploads/2023/06/document.pdf' or full server path '/var/www/html/wp-content/uploads/2023/06/document.pdf'.
Neither of these works, I get "is not a valid file" error.

I tested library on localhost with document in same folder as my PHP script and it works normally.

Any suggestions?
Thanks.