If I copy some content from one file to another text file, will Devonthink display the copied content from which file?
It’s not clear what you’re asking I’m afraid.
I think they are asking: if I copy some content from a file, will Devonthink display/indicate where the content was copied from.
Not without scripting, no the source of the text won’t be copied as well.
Please clarify what kind of file you’re copying from and to.