Hi Paulo @fcppenta
I suspect there are many ways to transfer files over USB, and hopefully @danielt will have a better suggestion.
I managed to get ssh (and scp) running over USB, once you have this file transfer should be easy. A step-by-step guide is provided in Section 188.8.131.52 of the getting started guide at developer.qualcomm.com/mlh The guide was written to allow a user to connect in the case where there is no display connected to the 410c DragonBoard. The guide has a lot of information you don’t need, but should provide you with enough to get started.
Full disclosure: I am an employee of Qualcomm Canada, any opinions I have expressed in this or any other post may not reflect the opinions of my employer.