Problem for write & read from file

When i testing my app using campanion, it work file for me. But when i want to test after install no directory created, and no file is write into directory.
here is my blocks for read and write into file

I am unable to see ‘create directory’ block.

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create directory block call when screen open.

As Boban said, ask for WRITE permission:

see also here: File path for unzip file component

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