Sacher Khoudari

Neither Cactus nor the Nissin i40 have wireless TTL capabilities, at least the Fuji versions (they have wireless TTL for other systems). Metz doesn't have it neither. Nissin's Air Commander is going to support Fuji soon, but you will be forced to get the oversized i60 or Di700. Or wait until Nissin decides to sell the Air Receiver for Fuji and then you will be able to attach the i40. At least the Guy at Photokina told me that a lot of Fuji-users requested that option and that he will forward that request fo Nissin. Of course, you can buy the totally oversized Fuji EF-X500. That flash is almost bigger than the X-T1/2 itself! My Nissin i40 is powerfull enough for all kind of situations.

As it was already said, Fuji does not offer that kind of file management. But there is a workaround that I do sometimes. It is cumbersome and requires a couple of minutes, but it works. Take out the SD-card, put it into any kind of SD-card reader and open it in any device you have. In my case, I have a wifi cardreader (search for Ravpower 5-in-1) and I log into that wifi network with my smartphone or tablet. Then rename the current folder to whatever you want. When you continue using that SD-card, your Fuji will create a new folder and put all new pictures into in. So when you travel from City A to City B, take your time (about 2 minutes I guess...).