Help, there's some liquid error!
Liquid error: Could not find asset snippets/products.custom_fields.liquid
This error can happen if you've deleted products.custom_fields.liquid, or if you updated your theme to a new version.
The snippet the error message is referring to is an automatically generated snippet that's maintained by the app and added to your theme automatically. The fix is simple. You can force the app to regenerate the template by interacting with field settings for any field. For example, changing the weights (ordering) your fields and saving will regenerate the template and the message will go away.