FILES/DIRECTORIES EXISTS crashed in Iphone & could not find files created using WRITE FILE in iphone

I tried to validate this file, systemVars.fileSystem.directories.document but apggyver preview crashed once running this logic.

There reason I am using Files/Directories exists logic is to identify the folder. I’ve created a PDF using write file base64. The process is successful however, I could not find the file inside my iphone.