Goto Settings -> General Settings -> Integrations and Create Authorization Code. see below image

Copy generated Authorization Code. see below image

Create Folder in Google Drive and copy that Folder Id. see below image

Paste Authorization Code and Folder Id and Select Option for Manage folder on Drive

Create Project Task and Add Document

You can Download Uploaded Document

Here you select Sinlge Folder option then document upload on Parent Folder

If you want to upload document in Multi Folder then you have to select Multi Folder option

if you select Mutli Folder then Goto Settings -> Google Drive -> Manage Google Folder and Create Folder

Create/Write Project Task and Add Document

Here you select Multi Folder option so document upload on Created Folder

If you want to upload document on Record Wise Folder then select Record Wise Folder Option

Create/Write Project Task and Add Document

Here you select Record wise Folder then Document will be upload like.. Parent Folder = Odoo Demo , Sub Folder = Project Task and then auto create Record wise Folder . see below Image