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I have Moto G S5 (Android 8.1). I connected it to my laptop (Ubuntu 18.04). I moved some files (about 4 Gb) from a folder in internal storage to root folder of the internal storage.

Transfer happened succesfully. But the File manager of android doesn't show those files in the root folder. And I can access those files from my laptop, but when I try to open it. It shows Unknown MTP error. The SD card capacity when viewed from Android has decreased by 4 Gb (same as those files), but when I see the SD card capacity through Ubuntu the capacity remains intact.

Please suggest me some steps to recover those files. I tried copying those files back to the original location, but I get the same MTP error.

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    raw ideas: a) use a terminal emulator or b) adb shell to gain shell access, then use the mv command to move the files back to their original location. I wouldn't trust MTP farther than I can throw my house. To my experience, the adb shell approach has the best chances (even better if you have root access). – Izzy♦ Oct 13 '18 at 22:35
  • @Izzy Isn't adb a tad slow when transferring big files, though? – Death Mask Salesman Oct 14 '18 at 10:28
  • @DeathMaskSalesman compared to MTP? ROFL And then, OP wants to move files within the device, so that's not relevant (it's no adb pull – though in my experience, even that is faster than transferring via MTP (but then again, what is not?)) – Izzy♦ Oct 14 '18 at 14:27
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    @Izzy Can't argue with that. I still don't get why Google picked MTP to begin with. – Death Mask Salesman Oct 14 '18 at 16:03
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    @Nikhil once you got the knack it's easy (I use it almost daily, so I might be prejudiced). The only troubles are drivers (when you're on Windows), and then maybe getting the device properly detected for the first time (not hard either if you know how). A little self-promotion: my article ADB for end-users might help getting you interested to dig-in – and started :) – Izzy♦ Oct 15 '18 at 6:54

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