A Workspace Admin needs to follow these steps to request the feature:
- Go to Sketch, log in as the owner and switch to your Workspace using the switcher in the top-left corner next to the Sketch logo - make sure your workspace name is showing.
 - Head to People & Settings on the left sidebar.
 - Select the Settings tab and click on “Request to restrict document uploads for Editors in this Workspace”.
 - Fill in the contact form information and submit your request — our support team will get in touch shortly with the next steps.
 
If needed at any point, you can disable this feature by following these steps:
- Go to Sketch, log in as the owner and switch to your Workspace using the switcher in the top-left corner next to the Sketch logo - make sure your workspace name is showing.
 - Head to People & Settings on the left sidebar.
 - Select the Settings tab and click on Enable Uploads.
 - Confirm this request within the pop-up by selecting Enable Uploads