[Q] How to delete ".thumbnail" folder and free up some space?

Hi guys! I have an Xperia Z3 D6603 running on official Android version 6.0.1 with build number 23.5.a.0.575, not rooted. I am not a tech guru and know very little of all these devices. My problem is that almost 5.0 GB of my internal storage is consumed by ".thumbnails" folder which I want to delete. I have searched some solutions and found out that normally people get some free space till these files reappear and in the mean time they can make this space useful but the case is different here. I have tried to delete this folder and all the containing files but even though the folder disappears for some time, I still don't get any free space even for a short time and the files start to reappear after some time. I don't have any Gallery other than the Album app and as it cannot be deleted, I have tried disabling but the problem still remains. I have also tried creating a new folder with the same name but the system would rename it to ".thumbnails 1" and another folder with the name ".thumbnails" would reappear . I had the same problem also with Lollipop on this device. I use FILE KOMMANDER, it is the system app.
Any help is highly appreciated.

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