How can I set the server and folder root for the document picker’s open folder?
In this example, I already am connected to my samba server in the Files.app, and raid is a shared location to which I can manually navigate… can I do it automatically with Scriptable?
If you had a bookmark defined at a root level and you knew the additional path components (I assume you would as you know the ultimate path), then I think you should be able to use joinPath with the bookmark to point to a sub directory, and then listContents to get the files in the directory.
Then you would need to build a UI listing to enable you to select the file(s) you want to process