You want to create policy to block file uploads from on Edge SWG.
Edge WSG with SSL Interception enabled.
What can be done:
You can use a dedicated method for such a scenario called Application Operation,
Note: in order to use Application Operation in the VPM you need to make sure that you have enabled the Application classification service in settings :
2. Choose the type of sites, for example, Google Drive, or use Any for all sites.
3. Choose Upload Files:
4. Use Deny action
5. Apply the Policy