I was try to check incoming file length in Conditional node, and it doesn't work.
After all tests, I found, that Conditional output is always Success if I use >, <, >=, <=. Only = works.
1>2 - Success
1<2 - Success
2<1 - Success
2>1 - Success
And go on

But 1=2 - Failed. And 1=1 - Success.