File upload on starting build

We have a scenario where we would like to operate on a file and it would be easiest to just upload it on starting the build.
Just like any other web pages do.

Hi Michal,

We don’t have any plans to add this functionally. Generally, continuous integration servers work on files committed to a source repository. You can also use a File System repository to add files to your build from a shared folder.

Sure, but I wanted to ask, because we had such discussion internally in our company, because we have a separate versioning system for documents from which we generate some translation files.
This system has no API for getting such document.