离子 - iOS - FTP传输

Question

使用Ionic app，我在iOS上遇到FTP传输问题。它适用于Android。 使用离子本机FTP插件。连接成功，但在大约20秒内我收到连接超时错误。

[Log] Login successful – "Init connect and login OK. (iOS always succeed)" (cordova.js, line 1731)
[Error] Stream timed out with no response from server.
    (anonymous function) (cordova.js:1731)
    (anonymous function) (main.js:3835)
    __tryOrUnsub (vendor.js:23021)
    error (vendor.js:22980)
    _error (vendor.js:22911)
    error (vendor.js:22885)
    (anonymous function)
    callbackFromNative (cordova.js:293)
    (anonymous function) (ios-wkwebview-exec.js:129)
    runTask (polyfills.js:3:10845)
    invokeTask (polyfills.js:3:16802)
    n (polyfills.js:3)

任何想法如何解决？ 提前谢谢。