Lightning SD Card Reader not reading

I just bought this adapter and was able to upload photos once, but it doesn't seem to do anything now.



I'm using an iPad Air.



I'm opening iPhoto first, plugging in the Lightning connection and then inserting the SD card.



I've also inserted the SD card, plugged in the Lightning connector and opened iPhoto.



No luck. Any ideas?



EDT: I just put my iPad to sleep, plugged in the Lightning adapter and turned it back on and now it's working. So particular!

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