When you switch from the Heredis 2023 for iOS to Heredis 2024 for iOS, you can convert your file directly on your mobile device as follows:
Open your genealogy file in Heredis 2023 and click on "Tools" :
Select "Export family Tree":
When the bar reaches 100%, select the target application (the one you want to open the exported file with => HEREDIS 2024 for iOS).
Once the export is complete, the exported file will automatically open in Heredis 2024 for iOS:
Finally, simply close the Heredis 2023 export window: