Within Teamwork, you can upload different company logos for each individual company on your site.
To view the Companies area, click the More option in the main navigation menu on the left of your site and select People.
In the People area, select the Companies tab from the horizontal menu to view.
Click the options button (three dots) to the right of the relevant company and select Edit Company.
In the company details modal, go to the Essentials tab and click the blue Edit button below the logo area.
Use the Choose file option to browse files on your computer. You can select GIF, PNG or JPG file formats, and Teamwork will resize it to fit 200 pixels in width.
For more information, see: Adding or Editing a Company