When the phone is connected via USB then Windows should mount 1-2 drives. One of it should be the one you need. Just copy it (Copy&Paste or save it to the wanted path)
When the device is connected to the PC with a USB connection, it uses the MTP protocol. It is very difficult to work with this protocol and to automate it.
Assuming that the device is connected to the same local network as the PC then your Windows app can send the file to your Android app directly.
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