Files open incorrectly. What to do?

Co
3

I received a very important document via email, sent to my cell phone. So I downloaded it. But when I wanted to open it, a window opened saying: "Open with". There were various choices. I tapped "Huawei Files" and accidentally clicked "Always" instead of "only once". Now the document is only displayed with Huawei files, and I no longer open it and no longer print it. Can I somehow undo this and open it with another program?

Wi

What is the file extension?

Co

Pdf. I downloaded it several times and once it says zip.

Wi

Install a PDF app such as B. Acrobat the next time you tap on the attachment, Android should ask if you want to open it with another program.