I think if you buy this to use with iPad or iPhone. Once pasted, you will be prompted to install the ixpand app. Well the app worked for a while before I couldn't move the files and instead I got a message saying "The operation failed, please try again later." I decided the drive was bad so sent it in I returned it to Amazon and bought a new one and the same thing happened. I contacted Sandisk and their solution was to only copy a few files at a time. Well I'm trying to copy a file and it still doesn't work.
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