Import Records from File preventing deletion of old records
I have created a FileMaker DataBase and I have imported data from an Excel file. Now I would like to add data from other Excel file, so I went once again to the Import Records/File... and set the desired Field Mapping. After pressing import, I have noticed that all new records were created and that the old records were deleted from the FileMaker DataBase.
How can I import this second file and preserve the existent records?