In an Windows Forms app you can customize SaveFileDialog with checkboxes and buttons etc
How can I do the same with the FileSavePicker in an UWP app? Is there any way to add custom UI controls to the FileSavePicker dialog?
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FilePicker does have some options to add file type filters and customize its options : https://learn.microsoft.com/en-us/uwp/api/windows.storage.pickers.filesavepicker
but it does not provide a way to actually change its UI o some deep customization, but if you really want this feature in a future SDK you can request for it on uservoice : https://wpdev.uservoice.com/forums/110705-universal-windows-platform