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Unfortunately, it is not possible to change the "Choose File" and "No File Chosen", since we use a standard file input element for single upload fields.
That element is not controlled by us, it is a native browser element, so it even looks different on each browsers.
The "Choose File" and "No File Chosen" button text is coming from the browser engine, and there is no way to control it.
You may enable the "Allow Multiple" option, when this option is enabled, then you can change the button text, example:
Let us know if you need more help.