I encountered this problem: on the Android version of Telegram voice messages lose quality. And so on all Android phones, as I read on the Internet the problem is common. And on the iOs version the voice is "clean". The microphone on my Android phone is even better than on my ios phone. "Clean" voice messages on Android can be seen in the Telegram beta 5.16. The sound quality there is relatively similar to the ios version of Telegram. Why does this happen and when will this problem be fixed? This problem already goes a lot of versions on Android.
Telegram Android 7.3.1 (22067), Samsung Galaxy Note20 Ultra 5G, 10 Q (29)