How to upload file by adding backend url. I have tried by using simple HTML code. But I need to upload fie with "progress bar" or else "please wait...uploading". And I am not able to install jquery, so can anyone help me to do this by using typescript.
HTML
<form action="/action_page.php">
<label style="font-size: 16px;display:inline;" for="img"><b>Upload File:</b></label>
<input style="width:250px;margin-left:5%;" value="file" type="file" id="input1" name="img" accept=".xlsx">