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If you edit a file on two devices at the same time, doesn’t Dropbox just create a copy of the file? Is that process what you’re referring to?

Sometimes Dropbox does, but mostly it seems to figure it out.

Sync thing on the other hand creates a conflict almost always.

I’ve never used syncthing, when you say it “creates a conflict”, does that mean the same file copy mechanism as Dropbox?

There are various strategies you can choose. If you mean creating a copy of the file with the conflict then yup.