Within Teamwork Projects, you can integrate your site with SharePoint and connect different group drives to your projects.
Click your profile icon in the top right of your site, and select Settings from the dropdown menu.
In the settings area, go to the Integrations tab where you will see an option for Microsoft SharePoint.
Once you click connect, you will be prompted to sign in to your Microsoft account and grant access.
Note: You will need company or tenant-level administrator privileges in your Microsoft Azure/Office 365 account in order to grant permission for the integration.
At project level, you will then be able to choose which SharePoint site and library to link to, as well as permission levels.
Working with external links
To allow non-SharePoint users (or users not currently logged into their Office 365 account) to be able to access your SharePoint files within Teamwork, you would need to enable external file sharing in SharePoint.
If you do not want to enable external links, you can select the I'll manage the access rights from within SharePoint option when linking in specific files to the project.
For more information, see: Enabling the SharePoint integration on your projects