When you say “There is already an existing file” do you mean on my computer? If so where?
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In the Proxmark3 directory you cloned from git earlier, that should be where you’re working from
If you enter the “ls” (list) command, it will show all the files in your current directory, among them should be “Makefile.platform.sample”
You can use
“cp Makefile.platform.sample Makefile.platform”
to copy it to the needed location and then edit it as before
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You are currently running the PM3 program, use “exit” to leave the program and return to where you compiled it
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