How are you getting your files into your board? Are you using JupyterLab and dragging and dropping the files into the file directory areas? I recommend on your PC to unzip the XSA file after Vivado creates and extract it to a folder. Then step into that folder. You should find the .bit and hwh files. You can drag and drop those up to board. Chrome is my preferred browser. That would be the easiest method. Place them in an overlay directory of your choice and you can do the following:
ol = pynq.Overlay(‘myproject.bit’)
That should get you setup if you have all the files staged first.
Regards,
-N