UploadedFilesPath syntax in yaml

I'm trying to add UploadedFilesPath to my yaml and getting errors. Can someone please help with the syntax?

I've tried:

UploadedFilesPath: "\mnt\mendix\myfiles\" and then

UploadedFilesPath: \mnt\mendix\myfiles\

The first one complained about quotes, which is why I removed them. When I removed them I get an error that DatabaseType is unknown and the app won't start. If I remove the UploadedFilesPath line the app starts successfully.