I raised this as well with the AvPlan and even Ozrunways team with there development.... but it is not there fault, the issue is with the Android operating system (kitkat or whatever) where previous versions allowed data to be read from the SD card the latest OS will not with many types of apps. You can do some 'jailbreak' with the particular models of devices to allow it to read from the card but it voids all warranties and has its own separate unique issues.
I had this problem when I bought a Galaxy phone and decided on the 16g version putting a 64gb card in.... ALL the large app I wanted to store on the card would not allow it only some very low volume apps would transfer and work.... a bit of a joke really and I was pretty angry after being told you can run apps from the card no problems patronizingly told "that is what it is there for".