Madden 2020 AMP CSV

[Aurorans]

Hello! I'm trying to import some players into a roster file, using the CSV importer exporter. However, when I load a CSV file, nothing happens. Does the importer/exporter only work for 08, or does it work for all years? Thanks

Steps taken:

Open original 2020 roster file
Browse to and export Phillip Lindsay as CSV
Open ALL-TIME roster
Import CSV
Nothing happens