Since more and more of the Salesforce Classic technology is becoming outdated and phased out, Salesforce Classic is not supported anymore for the Plauti apps and features. For now most features still work, but they are not maintained anymore and will not be fixed if they stop working. Classic features that can be selected for use in Lightning, such as Visualforce page overrides, are not supported anymore either. Please keep this in mind when configuring features based on Classic technology.