I’m not sure which FileZilla Android app you’re using (I can’t find any on the Play store), and the one I did find on a third party app store doesn’t seem to have anything in common with FileZilla Desktop or Server. So this looks more like another developer infringing on FileZilla’s brand than an official port.
So for the safety of your phone and your website, I would suggest avoid searching for FileZilla for Android specifically (it does not exist) and use another, more well supported FTP client instead. AndFTP seems to be quite well supported, although I’ve never used it myself.
It doesn’t really matter which FTP client you use. We write instructions for FileZilla because it’s the most popular (and most people manage their website from a desktop OS, not a mobile OS), but any FTP client should work with our hosting.