best FTP + browser app?
I need to make a large website available offline. Yes, offline. The files (mostly static HTML, some images, a little Javascript) are a large collection of legal texts - there are > 5000 files using > 450 MB file size all in all. The files have to be made available locally for people who are in a factory or another place which has no internet access. They will have to download everything using FTP, and then look at the files using some browser that can open local HTML files.
While on Android, I can use any FTP app and download the files to somewhere on the SD card, and open them with the Firefox browser, this is much more difficult on iOS. The only way I found so far is using "Documents 5", use their not-very-user-friendly FTP functionality to download the website, and then open index.htm with the inbuilt browser. There are some limitations such as: I can't see the download progress; when one file has changed, I cannot simply download that one file and leave the others as they are. There is a synchronize function and I activated it, however I can't see if it does anything.
I would very much appreciate other ideas how to do this (other than, writing an app of my own).
-Michael
iPad Air, iOS 9.2.1