data/uploads/<uuid> is what a restore needs but nobody can find a PDF
in it. files/<space>/<folder>/<name> holds the same bytes as the tree
shows them. Renames and moves become renames and moves on Drive, gone
files go to Drive's trash, emptied folders follow, and clashing names
get the later node's id. Failures there are logged, not fatal: the
restorable copy in data/ is already up when the view runs.
