Thank you for reaching out to the Community! Can you please give me some more information about what you are trying to edit? A screenshot would be extremely helpful! Thanks.
If you just want the document itself, the Word file will be fine. If you're needing a specific visual element, such as a header, logo, etc. then you can use the PNG image our system generates of the first page when you upload the document. Documents themselves can't be embedded into emails sent through us, so you'll need to use the image generated.