Hello.
Dependencies were added using Nuget.
Page has references to CDN:
<link rel='nofollow' href="//cdn.syncfusion.com/18.4.0.43/js/web/flat-azure/ej.web.all.min.css" rel="stylesheet" />
<script src="//cdn.syncfusion.com/js/assets/external/jquery-3.3.1.min.js"></script>
<script src="//cdn.syncfusion.com/js/assets/external/jquery.globalize.min.js"></script>
<script src="//cdn.syncfusion.com/js/assets/external/jsrender.min.js"></script>
<script src="//cdn.syncfusion.com/18.4.0.43/js/web/ej.web.all.min.js"></script>
<script src="//cdn.syncfusion.com/18.4.0.43/js/common/ej.webform.min.js"></script>
Control is added on page (inside UpdatePanel):
<ej:UploadBox ID="UploadBox1" runat="server" AllowDragAndDrop="true"
ExtensionsAllow=".jpg,.pdf"
Locale="en-GB"
MultipleFilesSelection="true"
SaveUrl="DocumentUpload.ashx"
RemoveUrl="DocumentRemove.ashx"></ej:UploadBox>
When page is shown in browser - control is rendered (Browse button is shown) but console has JS error:
Uncaught TypeError: t.Uploadbox.Locale[this.model.locale] is undefined _dragAndDrop http://cdn.syncfusion.com/18.4.0.39/js/web/ej.web.all.min.js:10
_initialize http://cdn.syncfusion.com/18.4.0.39/js/web/ej.web.all.min.js:10
_init http://cdn.syncfusion.com/18.4.0.39/js/web/ej.web.all.min.js:10
h http://cdn.syncfusion.com/18.4.0.39/js/web/ej.web.all.min.js:10
f http://cdn.syncfusion.com/18.4.0.39/js/web/ej.web.all.min.js:10
Error is shown and no popup "Upload Box" is shown after selecting file. I tried to remove Locale in control but it didn't help.