And in the common case that the text is only on my clipboard, for example if I copied it from a web page or shell, then I have to go to all the effort of first saving it locally into a file somewhere in the file system, before laboriously navigating to it again with 1Password (often having to wait for my USB hard drives to spin up again as my Mac is frozen for 50 seconds showing the file dialog that scans all the attached storage devices) and finally adding it as a file attachment.
And then after all that extra busy work, the plaintext secret file now is floating around unencrypted in my file system somewhere, which is exactly what I didn't need.