Found a possible solution, probably this bug occured because of a new Samsung update, which came with some new security feautures. So, the solution is this: I have to go to Settings—>Apps---->Krita---->Mobile data. There appeared a new slide “allow data usage while Data saver is on”. Tap on it. After that i still can’t save a file to the Pictures directory, but I’m able to create a new folder in Documents, and there saving works just fine.
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