You can provide specific folder for the file explorer window to open when you try to upload files. You can refer and try one. This has several security concerns and works fine for local. You will have no idea about the specified directory when on server and hence my suggestion would be to leave it up to the user to explore and choose one.
Or maybe something that can get the files from the user side
You can try drag and drop approach to provide a convenient file upload user experience.
Other than these, you cannot perform any other customization like design changes.
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