Osco will update products on Marketplace when there are updates on Shopify. This will happen in real-time. This doesn’t happen in the opposite direction. If you update products on Marketplace, it won’t update the products on Shopify.
The updates or syncing will only happen on product attributes that you have selected to be in-sync (ie: product status, title, description, image, price). You can change this by going to Settings page using the top navigation.