
Hi @edelcast ,
When you say "import" what do you specifically mean? If I import data from any location into the dataverse it will not sync changes to the data source by default. You would need to have integrations built with something like Azure Data Factory, Kingswaysoft, Scribe, SmartConnect or other to do these integrations. The dataverse supports some key capabilities around this like change tracking etc. See the following article that might help you in your path to integrate your mainframe environment and Dataverse. https://docs.microsoft.com/en-us/powerapps/developer/data-platform/data-synchronization
Hope this helps.
Thanks,
Drew