Is it possibile to add a progress bar when a document is uploaded into Pega. At the moment the rule that manage the attachments (pzMultiFilePath) is final internal so we don't have the possibility to modify it. We would like to avoid a customization of this rule in order to not lose enhancements features of future upgrades. In next versions would be possible to provide this feature or at least to declare the rule as not final/internal to allow the customization of the single rule?