I am using a FileSavePicker so the user can choose where to save a file. I want the default location the file is saved be 'Documents\MyFolder', but the field SuggestedStartLocation won't take a filepath; only the very limited list of PickerLocationId enumerations can be accepted.
I notice that once I save a file it will automatically open 'Documents\MyFolder' in the future, as described here, yet I can't find any way to force that to always be 'Documents\MyFolder'.
How can I either:
A.) Get FileSavePicker to default to the location 'Documents\MyFolder'
B.) Replace FileSavePicker with something else that acts as desired