Apart from attaching documents from your personal desktop now you can easily upload your Google documents, spreadsheets, presentations, etc for your project into Zoho Projects. This way your documents stored in Google Docs can be shared with all the team members in your project.
In Projects, select the required project, and then click Documents. Click the Upload drop down arrow to upload files. Click Google Drive to attach files from the drive.
Choose the files to upload and then click OK to upload. The files are imported into Zoho Projects.