Display external cover Notion API with Next.js

Question

I'm creating my portfolio using Notion API, Next.js and Tailwind thanks to this wonderful work : https://github.com/samuelkraft/notion-blog-nextjs

However, as you may know, images hosted on Notion has an expiration time. I tried to use <img src={blog.cover.file.url}/> but if I upload a cover on my Notion page from an external link, all my code breaks. I had a look on this documentation : https://developers.notion.com/changelog/page-icons-cover-images-new-block-types-and-improved-page-file-properties but I don't know how to mention it's an external link.

Do you have any idea how I can solve this issue?

Thanks a lot in advance