I transferred the whole list of my tax files from 2019 tax year to 2020 to my laptop before I had my tower.

Now I want to transfer those files on laptop to my tower.  I tried moving each file as needed by downloading to a flash drive and then upload to tower.  But it doesn't seem to work.  Every so often I will have a box show up that I am mismatched and then the file will move onto the tower?  

How can I network my laptop to my tower so I can move the whole list?