Everything here describes the Android app and the macOS and Windows companions: connecting a phone, repairing an interrupted recording, aligning audio, and the things these tools deliberately will not do.
macOS companion
Install, connect a phone, repair a recording.
Windows companion
The same on Windows, including the driver question.
ADB setup by phone brand
Pixel, Samsung, Xiaomi, OnePlus, Oppo, Vivo, Motorola, Sony, Nothing, Huawei.
Wireless ADB
Pair over Wi-Fi when there is no cable.
The repair workflow
What happens, in order, and what you should see.
Audio alignment
Recovering the audio track and lining it up by ear.
What this cannot do
Read this one before believing anything else.
Troubleshooting
Keyed to the message you actually see.