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The shared link resource has three permissions that can be updated using the permissions field: can_preview, can_download, can_edit.
The can_edit option can only be true for files. Also, if the admin has restricted shared links from having edit access in the admin console, you will not be able to set can_edit to true.
curl -i -X PUT 'https://api.box.com/2.0/files/123456789?fields=shared_link' \
    -H 'Content-Type: application/json' \
    -H 'Authorization: Bearer [ACCESS TOKEN]' \
    -d '{
      "shared_link": {
        "permissions": {
          "can_preview": true,
          "can_download": true,
          "can_edit": true
        }
      }
    }'