我在使用 PT Lite (9.0.6.26) 时遇到了问题，无法让 S/R（Send/Receive）通过 USB 选项正常工作。我收到错误提示：“unable to write to USB device”（无法写入 USB 设备）。我尝试通过 Android 设置 > 存储 > 格式化来格式化 USB。因此我知道该 USB 目前已在 Android 系统内格式化为（FAT32）以支持读写。可以在 Android 系统默认的文件管理器中浏览该 USB。系统已识别并看到该 USB。我能够使用文件管理器将内部存储中的照片复制/粘贴到 USB 存储中，从而成功写入 USB。
我使用的是通用 OTG 适配器和 Kingston DataTraveler G3 USB。我尝试过不同的 OTG 和不同的 USB 设备，但结果仍然相同，提示“unable to write to USB”（无法写入 USB）。
值得注意的观察结果：手机型号为 Redmi 7A。Android 版本：9 PKQ1.[Phone Removed]系统文件管理器能够读写 USB，但来自 Play Store 的第三方应用（如 ES File Explorer）虽然能看到该设备，却无法打开设备以读取内容。似乎该 USB 设备受到 Redmi Android 设计的系统保护，仅允许其系统默认应用访问。
我能够在运行 Android 8.1.0 的 Moto G5S Plus 上使用相同的 OTG 和相同的 USB。PT Lite 通过 USB 进行 S/R 运行正常，没有问题。
其他人是否遇到过在手机上使用“非官方” Android 版本以及使用 PT Lite 通过 USB 进行 S/R 的问题？（SD 卡选项在 S/R 中运行正常，而且我也无法让 Wifi Direct 在手机和 PC 之间正常工作。）花了 $$$ 买了一部新手机，希望 MTT 能在偏远地区使用它进行 PT S/R，结果却如此令人沮丧和失望。
I’m having trouble with PT Lite (9.0.6.26) and getting S/R to work with USB option. I get error, ‘unable to write to USB device.’ I tried to format USB via Android settings > storage > format. So I know the USB has been formatted (FAT32) currently for read/write within Android system. The USB can be explored within Android system default file manager. The USB is recognized and seen by the system. I was able to write to the USB from within the file manager with copy/paste of a photo from the internal storage to the USB storage.
I am using a generic OTG adapter and Kingston DataTraveler G3 USB. I have tried a different OTG and a different USB device, however still the same result, ‘unable to write to USB’.
Observations to note: The phone is a Redmi 7A. Android version: 9 PKQ1.[Phone Removed]The system file manager is able to read/write to the USB, however a third party app from Play Store such as ES File Explorer sees the device but cannot open the device to read the contents. It seems the USB device is protected by Redmi Android designed system for it’s system default apps only.
I was able to use the same OTG and same USB, on a Moto G5S Plus, running Android 8.1.0. PT Lite S/R to USB works without issue.
Has anyone else had issues with ‘unofficial’ Android flavors on mobile phones and using PT Lite S/R with USB? (The SD card option works fine for S/R and I couldn’t get Wifi Direct to play nice either between phone and PC.) Frustrated and bummed after spending $$$ on a new phone with the hopes a MTT could use it for PT S/R in a remote location.
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