Quick question

Greetings, I have a quick question. I am just getting started in UE5 my current workflow is with 3dsmax direct link and I stumbled upon few issues, one of which is if I modify something in Unreal Engine and then I synchronize my modified textures are back to default again and also I would like to know if there is a function which would enable me to synchronize only 1 specific file with direct link, Thank you so much for your time.