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I have managed to find working solution.
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In Designer I have added in Multi field action.
First action in Multi action is File upload. Second is Custom code.
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File upload fields has defined ID (e.g: file_1).
In Custom code I have added button element and JS code:
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="clear1" onclick="return false">Remove</button>
<script type="text/javascript">
 var control_1 = $("#file_1");
 $("#clear1").on("click", function() {
 control_1.val("");
 });
</script>

That's it.
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I hope that this will help someone one day 🙂