try this it might solved
I just solved this by myself on my Iphone 5 IOS 8.3. It took me over an hour to find out!
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Make sure the Wireless Flash app is close. 2. Go to Setting then Wi-Fi
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Pick your Sandisk wifi name then connect to it
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Once you got it connecting stay where you are then find the big “i” icon next to the singnal bar right of your Sandisk wifi name
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Write down the Subnet Mask number you see e.g 244.244.244.0
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Write down the Router number e.g 134.443.0.1
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Open Safari then type on the address bar the subnet number wrote then click Go, let it liad for a while about 20 sec
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Then stop the loading then replace the subnet number with the Router number then click Go.
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Now you should connect to your Sandisk wireless flash drive via Safari
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Try to browse a pdf file or something
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Open your Wireless Flash app
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Hopefully the magic comes true!