Lost original i94 but I have extension, do I still need the original?

[IreneF]

I'm going to file my adjustment of status soon so I'm new to all of this and I'd appreciate some help. I've been furiously looking for my original i94 but I think I lost it. I did file an extension, which I have. My question is, will I need my original i94 when I file my AOS or will the extension be enough?

Thanks for your help!