The format must be JSON.

The folder structure is as follows:

• Each folder will have a "Name" attribute as well as a "Folders" attribute declaring any subfolders inside within square brackets [ ].
• The keys and values are separated by a colon.
• Each folder will be surrounded by curly brackets { }.
• Commas separate folders.
• At the very top level is a "Folders" key declared, surrounding everything with square brackets.{"Folders":[{"Name":"Folder Name"},{"Name":"Folder Name 2"},{"Name":"Folder Name 3"}]}

There can be multiple level of sub-folders.

View the example structure:

{"Folders":[
    {"Name":"Project Management"},
    {"Name":"Contracts"},
    {"Name":"Engineering", "Folders":[
        {"Name":"Assets"},
        {"Name":"Requirements"}
    ]}
]}

To view or change your Initial Folder Structure, go to Salesforce Setup > Custom Code > Custom Metadata Types > click 'Manage Records' next to SharePoint Object Settings and select your object.