Tried it on my other non Xf forum. Even though the file is a jpg ie 5748.jpg the file browser is seeing it as image:5748 so not seeing the extension. I'm guessing XF is the same . What's the right method?
which is an issue with WebView in some versions of Android 4.4.
From that it sounds like you'll either have to use a 3rd party file explorer (accessed via Documents I guess) such as Solid Explorer or ES File Explorer. The other option, which might be better if you can, is to upgrade Android to 5.0/5.1.