You are able to update products from 4apet with Stock Sync. Just choose on 4apet template after choosing to update existing products in your store.
1. Go to Setup New Feed > Choose Update existing products.
2. Choose or search for 4apet template.
3. Once created the template will direct to the feed details page because there is no file setting needed to fill up.
4. If you would like to do any changes in the field mapping section, then you can click Edit settings and go to the second step.
5. If there is no any changes, you can proceed with the Start Process to update the products.
These are the available fields that can be updated for 4apet.