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I'm new and this is my 1st answer. Try the following:
`Button["Import"Button["Import", file = SystemDialogInput["FileOpen"]; If[\[Not]If[ TrueQ[fileNot@TrueQ[file == $Canceled], data = Import[file]], Method -> "Queued"]`"Queued"]
`Button["Import", file = SystemDialogInput["FileOpen"]; If[\[Not] TrueQ[file == $Canceled], data = Import[file]], Method -> "Queued"]`
Button["Import", file = SystemDialogInput["FileOpen"]; If[ Not@TrueQ[file == $Canceled], data = Import[file]], Method -> "Queued"]
