Would it be possible that the zip file uses the name of the folder, the downloaded files are in? That would be more related as archive.zip.
E.g. for a download of:
Test folder/test file 1.pdf
Test folder/test file 2.pdf
-> the file name of the zip would be Test Folder.zip
If you download the folder directly (and not files in the folder), the file name would also be Test Folder.zip
That would be very helpful.