For anybody still having issues with Facebook/Shopify not syncing.
I recently opened a store on Facebook and became instantly annoyed with the time delay from updating on Shopify and the changes syncing with Facebook.
This worked for me:
- Deactivate product on Shopify
- Make any changes
- Activate product on your sales channel again on Shopify.
There is a significant delay for the changes to take place on Facebook. They first need to vet the changes for any unauthorized content. It took about 20min to add a photo to a product on Facebook, but it does eventually go through. I suppose this is a bit like Facebook's ad policy, changes are always reviewed by them first.