It’s just the download button, truly. They already associate that icon with saving files from the web. The down arrow pointing to a rectangle or laptop icon in word or similar app wouldn’t be too ambiguous…

Or, truly, the floppy will just become a nebulous, originless heiroglyph meaning “keep this information for later and let me put it somewhere to find it again,” and some Gen. Beta child will get curious and learn about ye olde days of magnetic media from Wikipedia.