Yes.
- Create a zip file using the Bash zip command, or other tool.
- Select and copy the zip file in the Finder
- Create a topic or reply, and paste using ⌘Vj, or the menu Edit > Paste, into the edit area.
- Observe it pastes ONLY the file name, not the actual file.
Running Google Chrome 76.0.3809.87 (3809.87) on macOS 10.14.5 (Mojave).
Also occurs on Brave Browser 76.0.67.123 (67.123).
Sam, if it is working for you, what versions of Chrome and macOS are you running?