To deliver your work, all Members of a Team, including the Team Lead, must use the ASSETS functionality in the Project Workstream.
To do this, you need to go to your Project Workstream and click on the ASSETS tab. On the ASSETS page, click on Add File (or click on Create Folder - depending on how many files you need to upload for a certain task). Upload your work. You're done!
Other Members as well as the Hirer could access and download these files, as needed.
You can also change each file or folder's name, download each item, or delete and remove the files altogether by clicking on the ellipses (...) next to each file or folder, and selecting the appropriate option.