Grr camera problems

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I took a beautiful photo of a very strong, bright, double rainbow, when we were in Llangollen earlier today. It was the best rainbow I’ve ever seen. But my mobile phone is not working well. If I put something on Instagram it duplicates the photo. It also seems to duplicate other photos. I keep having to delete lots of photos (which I did this afternoon after missing the spectacular rainbow). The photos are Mb not Kb. I wish I knew how to change the file sizes. I will have to find out how.