nRF Toolbox DFU Invalid file

[Jim]

     When I use the nRF Toolbox to upgrade the nrf52832 device on the mobile phone (huawei mate9 Android8.0), I have the following questions:
     The first time I opened the update package pack.zip with nRF Toolbox, and it can be upgraded successfully, but when I open the pack.zip again with nRF Toolbox for the second time, nRF Toolbox prompts the error: Invalid file. I transferred the pack.zip from the PC to the phone again. Opening the new pack.zip file with nRF Toolbox still failed. What is the reason?
     Also, in those cases, does nRF Toolbox recognize pack.zip as an Invalid file?

[sunming]

It was happened when you use the default huawei file brower, you can try to install some other file brower, which can be used when select the OTA file, for example, ES文件浏览器, which I used to solve this problem.