luci/modules/luci-base/luasrc/view/cbi/upload.htm

<%
	local t = require("luci.tools.webadmin")
	local v = self:cfgvalue(section)
	local s = v and nixio.fs.stat(v)
-%>
<%+cbi/valueheader%>
	<% if s then %>
		<%:Uploaded File%> (<%=t.byte_format(s.size)%>)
		<input type="hidden"<%= attr("value", v) .. attr("name", cbid) .. attr("id", cbid) %> />
		<input class="cbi-button cbi-input-image" type="image" value="<%:Replace entry%>" name="cbi.rlf.<%=section .. "." .. self.option%>" alt="<%:Replace entry%>" title="<%:Replace entry%>" src="<%=resource%>/cbi/reload.gif" />
	<% else %>
		<input class="cbi-input-file" type="file"<%= attr("name", cbid) .. attr("id", cbid) %> />
	<% end %>
<%+cbi/valuefooter%>