Work flow and files

We have problems with the work flow because it does not link the process with more than 3 people.

When the work flow is of 3 people or more it does not advance, that is to say the first translator has his status in "In work", the second in "Prepare" and the third in "Prepare" but it only runs the process from the first translator to the second one.

In the same workflow it does not load the files.

The files sent to translator A do not reach translator A and the files that translator A loads do not reach translator B and so on.

How can we make the workflow run completely and pass the files automatically from one translator to the other?

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