Connecting to my TimeCapsule from the Internet

It should still work.. you may however have trouble with the Dynamic DNS part. The best and actually only proper solution is to pay for a static IP from your ISP.. then the whole problem of changing IP goes away. Anyone who seriously wants reliable remote access will do this.

Some people have got the global DNS to work.. just look it up.. I personally have a static IP.. since for me access that is reliable is important so I really cannot tell you how to do it.

The other solution is use a non apple router... Apple deliberately make their routers conform to the apple network requirements.. that means there is no valid method to access files from an ipad.. since apple have not provided a method to do that.

SO the other right solution.. is to push the Apple routers to bridge mode.. if they are not already.. and replace your current router function with a vpn router.. these are maybe a $200 for lightweight business type.. you can buy even cheaper ones that run third party firmware.

There is vpn app built in or available on all OS.. iOS, Mac, everything. The router will have standard ddns clients built in that work.. and vpn is secure.. the method used by filebrowser I am sorry to say is not secure. It is actually something I recommend against.. since opening ports for SMB in internet routers is asking for trouble and the only port that seems to work is so obvious.

If you want the access.. spend the money and do it right way first.

I suspect they have provided icloud as the solution.. if you refuse the solution they aint gonna provide another.

PS. Im guessing there's no Back to My Mac functionality from iPad?

As already mentioned.. apple do not treat the ipad as a file device.. it is designed to work with icloud and that is it. Anything else you do is with Apps that are allowed by apple but have no official support.

TC needs to be in NAT mode to allow the WAN sharing over iCloud (apparently).

That is what we have found.. Apple nowhere states this in black and white but the setup has to be the TC as the main NAT router and no other.. Double NAT which you have tried only makes it worse.. not better.

However access from a Mac is relatively simple.. you just need the TC bridged and port forward AFP (548) in whatever you main router is.

The main router probably can also do dynamic DNS.

So you need to pick.. if you want to use BTMM with a Mac.. you can do it if you replace your existing modem router with a pure modem and then use the TC as the main router..

Or you do it directly yourself using AFP protocol. But neither of these methods work from a ipad.

The only one that works from ipad is vpn.. so take your pick.

So if I have my TC in router mode: Off(Bridge mode)

Sorry these are opposites.

Bridge means no router.. that is the mode the TC has to be in to work with the virgin media super hub.

There is then no more configuration required on the TC.. it is now fully and totally up to you to read the manual for the super hub.. and find out how to forward the required port.. 548 TCP and to setup dynamic DNS.

Apple cannot help you because they don't make modems.. and they don't want to help you because you might not pay them money for itunes or icloud..

There is plenty on google to help you find the right method.. but you will need to add the port you need. eg.

https://www.youtube.com/watch?v=ds2Ew1wSv8I