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I am not totally sure what you want to do here.
There's a paste button beside the text input--if your clipboard has newline-separated urls, it should pull them all in one go. I know some users who have pasted like 10,000 urls all at once like this.
Have you tried this and not had it work? Did it not split by newline? Do you know if your text editor is using NL (newline) or TLCR (newline-carriage return)? I think it is supposed to be able to handle either, but maybe it is misfiring.