Thanks @deanishe and @raguay.customct
Dean did get that right, it act like when you copy a file then paste it in evernote app, the file got attached in that note. just we already have that with evernote workflow, but the idea/need is same here, copy a file/some files (I think 1 file solve the problem since for me that's most my scenario) itself then paste in other apps, not copy it to somewhere else, not copy its path.
will try the python code later. just one quick noob question: how should it be applied? Pasted the code into text editor, saved as a .py file, then what? always envy you guys who can code, seriously.