A ZIP attachment contains a document and a folder of images. You browse into the archive, open the document and start editing. Later, two files with the same name appear, and it is unclear which contains the changes. Avoid that confusion by giving the working copy a clear location first.
Extract into a separate folder
In Windows 11 File Explorer, right-click the ZIP and choose Extract All. Select a new, clearly named destination and open the document from there. Keep the original ZIP until you have checked the result. Browsing an archive is not the same as choosing a reliable place to save your work; what happens when you edit directly depends on the application.
Preserve the folder structure initially. If the document refers to nearby images or other files, moving only the main file may break those references. If extraction fails because the archive uses an unsupported format or encryption method, use compatible software rather than renaming its extension.
Save, close and reopen
Make a small reversible change in the extracted copy, save it and close the application. Reopen that exact file from the working folder. Confirm the change and its location before doing a long editing session. A recent-files list can be ambiguous when several copies share a name.
When returning the work, select the edited file from that folder, or create a new ZIP containing the required files. Inspect the outgoing copy before sending it. Do not assume the original attachment changed just because you edited an extracted document. Keeping the original and the finished version clearly named makes the next handover much easier.