pdf loading for ever

Hello FlipBook,

I have a red message inside the pdf set up: “Please wait! The book is processing…”.
The error

All my pdf were processing normally but suddenly I have this message with all. I thought it was a size problem, so I compressed it all and it was working again.
But two days after it’s not loading or processing anymore.

I have to upload it again so it can work again.
I also realize that when I go to chose my pdf in the media, it’s all surrounded by red, I don’t think it’s related to the plugin but I didn’t see this before: media.

Thank you for your help.

Yann