JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-maskmoney/3.0.2/jquery.maskMoney.min.js"></script>
<div class="container">
	<div class="row">
	    <div class="col-xs-12 form-group">
			<button type="button" id="btn-modal-maskmoney" class="btn btn-primary btn-lg">
                Click Me
            </button>
	    </div>
	</div>
	<div class="row">
		<div class="col-xs-12">
			<label>Mask</label>
            <input type="text" id="mask" class="form-control money" >
	    </div>
	</div>
</div>

<!-- The modal -->
<div class="modal fade" id="modal-maskmoney" tabindex="-1" role="dialog" aria-labelledby="modalLabel" aria-hidden="true">
    <div class="modal-dialog" role="document">
	    <div class="modal-content">
		    <div class="modal-header">
			    <h4 class="modal-title">Mask-Money</h4>
				<button type="button" class="close" data-dismiss="modal" aria-label="Close">
				    <span aria-hidden="true">&times;</span>
			    </button>
			</div>
			<div class="modal-body">
			    <input type="text" id="UpUltimoSalario" name="UpUltimoSalario" value="" class="form-control money" >
			</div>
			<div class="modal-footer">
			    <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
			</div>
		</div>
	</div>
</div>

JavaScript

$(function() {
	console.log('init app');
    $('#UpUltimoSalario').val('3.555,00');
	$('#mask').val('3.555,00');
	
	$('#btn-modal-maskmoney').click(function () {
		showModel();
    });
	
	initMaskMoney();
	setMask();
	
});

function initMaskMoney() {
	$("#UpUltimoSalario").maskMoney({showSymbol:true, symbol:"R$", decimal:",", thousands:".", affixesStay: false});
}

function setMask() {
	$('.money').mask('#.##0,00', {reverse: true, maxlength: false});
}

function showModel() {
	let modal = $('#modal-maskmoney');
	
	modal.on('shown.bs.modal', function () {
        $(this).find('input:visible:first').focus();
    });
	
	modal.modal('show');
}