Delete a File 

A file from a folder can be deleted by referring its File ID. The folder reference or a folder meta is used in the below code snippet. A fileID is passed as a parameter to the deleteFile() method.

The promise returned here will be resolved to an deleted file object which is a JSON.

Copied// Delete the file by passing the file ID to the method which in turn returns a promise
let filestore = app.filestore();
let folder = filestore.folder(1510000000109545);
let deletePromise = folder.deleteFile(1510000000107568);
deletePromise.then((fileObject) => {
            console.log(fileObject);
        });