我在使用 PT Lite (9.0.6.26) 時遇到問題，無法讓 S/R（Send/Receive）功能透過 USB 選項運作。我收到錯誤訊息：「unable to write to USB device」（無法寫入 USB 裝置）。我嘗試透過 Android 設定 > 儲存空間 > 格式化來格式化 USB。因此我知道該 USB 目前已格式化為（FAT32），可在 Android 系統內進行讀寫。該 USB 可在 Android 系統預設檔案管理器中瀏覽。系統已識別並偵測到該 USB。我能夠在檔案管理器中透過複製/貼上功能，將內部儲存空間中的照片寫入 USB 儲存空間。
我使用的是通用 OTG 轉接頭和 Kingston DataTraveler G3 USB。我嘗試過不同的 OTG 轉接頭和不同的 USB 裝置，但結果仍然相同，顯示「unable to write to USB」（無法寫入 USB）。
值得注意的觀察：手機型號為 Redmi 7A。Android 版本：9 PKQ1.[Phone Removed]系統檔案管理器可以讀寫 USB，但來自 Play Store 的第三方應用程式（例如 ES File Explorer）雖然能看到該裝置，卻無法開啟裝置以讀取內容。這似乎是 Redmi Android 設計的系統保護機制，僅允許其系統預設應用程式存取。
我能夠在運行 Android 8.1.0 的 Moto G5S Plus 上使用相同的 OTG 轉接頭和相同的 USB。PT Lite 透過 USB 進行 S/R 運作正常，沒有問題。
有其他人遇到過在手機上使用「非官方」Android 版本，並使用 PT Lite 透過 USB 進行 S/R 的問題嗎？（SD 卡選項在 S/R 時運作正常，而且我也無法讓 Wifi Direct 在手機和 PC 之間正常運作。）花錢買了新手機，希望 MTT 能在偏遠地區使用它進行 PT S/R，結果卻如此，我感到非常沮喪和失望。
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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