Nice! Tangentially related: I built a (MacOS only) tool called clippy to be a much better pbcopy. It was just added to homebrew core. Among other things, it auto-detects when you want files as references so they paste into GUI apps as uploads, not bytes.
clippy image.png # then paste into Slack, etc. as upload
clippy -r # copy most recent download
pasty # copy file in Finder, then paste actual file here
Adding the word "then" to your first comment would have helped me: (lacking context, I thought the comments explained what the command does, as is common convention)
clippy image.png # then paste into Slack, etc. as upload
Also:
pasty # paste actual file, after copying file in Finder
