Thank you for your post.
So I may provide further information, what script steps are you using to "import a file"? For Example, Insert File and Import Records both require the file on the Server be in the Documents Folder to work properly.
To better understand how the Server is using the Get(DocumentsPath) function, check page 153 in the FileMaker Server 14 Help Guide.
I look forward to your response!
I have the same problem. Trying to import a table in the hosted file into another table with a server script but nothing happens. How did you solve your problem?