It's interesting to see this thread, it started in 2013. Today is 2017, I'm having Marshmellow on my Xperia Z3 Compact. The filename problem is still be not solved by Sony. It looks, like Sony just puts on all its customers. DSC_0001, DSC_0001_1, DSC_0001_2 .... What is difference between these files? Are they the copy of each other? Are they from the same event/time period? Having a backup of my photos on PC with 20!!! DSC_0001 - how should I categorize them, organize them, recognize which one is what?!!!! Shame to Sony development team!!!
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