All project files that used to be stored on DropBox are now available in Microsoft Teams. You are assigned to Teams channels based on your previous access in DropBox.
You can access files and folders directly in the online enviroment or synchronize them to your OneDrive to access them directly from the File Explorer.
Read more about setting up OneDrive:
https://support.accelerant.eu/supportdocs/using-onedrive/
Read more about synchronizing Teams files to the File Explorer: https://support.accelerant.eu/supportdocs/sync-teams-files-to-onedrive/