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invalid port

Android 9.0
Installation without difficulty.
However, computers, smartphones and USB sticks (on the router) can only be seen sometimes. In most cases a new installation is necessary so that the folders can be read. Files can be opened. With "Upload File here" only the file name is uploaded, file size 0 bytes. Sometimes that doesn't work. Then the error "invalid port abcdef" is output. abcdf is the beginning of my password. (Very strange!)
What am I doing wrong?
"Invalid port abcdf" can be eliminated by restarting the smartphone. But why is only the file name uploaded?

Linkback References

Ape Apps, LLC is an independent software development company founded in 2010 by Brandon Stecklein. Over the years, Ape Apps has published over 400 apps and games across various platforms. You can get in touch with Brandon on Twitter or by leaving a post on his wall @bastecklein
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