Hi Lichtzeichner,
since I know OpenMTP thanks to the hint of @AnotherElk I can highly recommend it!
It runs on my MacBook Air i5 1,1/16/1 TB (2020) with macOS 11.6 and I can copy all my data from internal memory of the FP3+ and also all data from my microSDXC SanDisk Extreme Pro 400 GB via the USB cable.
It’s great and it’s open source!