Is kendo-upload broken? Using Angular 9 and get what looks like a broken component looking for a list of classes called selectButtonClasses
<kendo-upload [saveUrl]="uploadSaveUrl" [removeUrl]="uploadRemoveUrl"> </kendo-upload>
Missing class list on this item in your template:
<div role="button" #fileSelectButton
[id]="focusableId"
[ngClass]='selectButtonClasses'