Found what I was doing wrong. I was turning off the display when doing the transfer. If I keep the screen on, the transfer will transfer to the end with no issues.
edit: I was having an issue when copying large files from Android to PC using smb server.
Interesting, thanks for doubling back to mention that. There may be a way to handle that without changing screen timeout. It might be worth checking this setting in MiXplorer.
Settings > More settings > Full wakelock (enabled).
Also, exempt MiXplorer from any power savings.
If those things don't work then changing the display timeout probably is the next best option.
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