Hello everybody.
I bought the application and installed it on Wordpress. I activated it and so far everything has gone well.
It turns out that when I try to load the PDF I can load it into the system, but when I select it it keeps loading constantly and I can’t exit it.
Hello @Leandro_Freire 
It’s really great to see you on our forum, I hope you will find this space useful 
I however have to mention that this forum is dedicated to Elfsight cloud apps, thus we can assist with only cloud apps-related questions here. As far as I see, you’re using our WP standalone plugin, which looks and works differently.
I advise you to ask your question codecanyon@elfsight.com, our team will try their best to provide the answers there 