Docker / Hetzner File Manager

Having a nodejs site set up on Docker / Hetzner I must to insert in the server some tables containing images (already associated with the database). I am thinking of copying the folders locally and then uploading.
But I can’t check if everything is ok because File Manager (on remote target) doesn’t allow to see anything
Is it possible, also for reorganization and cleaning, to somehow view the content of the remote server, as happens for normal sites in php?