You should care about your network not about the FTP client.
Even if the app stores password with encryption, FTP protocol send username and password in plain text, anyone on your network who is sniffing (Wireshark?) your data can read that.
Use SSH with SFTP, I advice you to use WinSCP client if your hosting has SSH enabled
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"Cowards die many times before their deaths. The valiant never taste of death but once"
(William Shakespeare)
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