Currently, the title of the Select button says always "No file chosen". That is due to the input element being re-rendered with a new one each time a file is selected.
What could be done to set a custom title for the Select button is to set a "title" attribute to the kendo-fileselect tag.
The title could be further enhanced so that it is localizable.
The file selection popup on iOS does not always open next to the file select popup. This is possible to replicate on the main page for the angular upload component https://www.telerik.com/kendo-angular-ui/components/uploads/upload/ and the stackblitz as well without any modification
https://stackblitz.com/run/?file=src%2Fapp%2Fapp.component.ts
Screenshot shows that the photo library/choose files popup opens in a seemingly random spot after the user taps it.