External MicroSD is not detected by Ankidroid

AnkiDroid (Android)
1

This task should be very simple but Ankidroid is not able to

  1. Detect the external card of my phone.
  2. Set the option to decide which card to choose to save the program data (audio, video, images, text).

In several places on internet, people suggest different methods, complicated by the way, but they do not work on all devices.

I hope you will find a standard solution to this problem. My phone is already full and I bought an external card and I have not been able to use it for ankidroid. I am using ankidroid for TV series and the resulting decks are quite large.

My phone: moto g71 5G 128GB.
Ankidroid versions tested: 2.9.3 and 2.15.6

Thanks for your attention.