While custom permissions are available on our Enterprise plan, they do not apply to board users today.
For board users, a standard Editor can upload and edit content, but can also delete content. Commenter and Viewer roles avoid deletion access, but they do not provide upload or full edit access.
If your team needs a permission set like upload access without delete access, Enterprise custom roles may support that setup for workspace or library users. Work with your customer success manager to confirm the right configuration for your team.
If you're interested in learning more about our Enterprise plan, check out this page for additional information.