Ok. Working.
[member=‘Brent Sorrentino’] :
Thanks a lot.
Actually - in my script, there were not many elements. This tutorial helped me. I do not know how, but I totally did not notice that they are guides to everything. The next time I have to be more careful.
Thanks a lot to everyone.
And by the way …
How to check if a file exists? 
I would be grateful even for the same indication link
Paul