File retention file age

From manual:

File age

Currently retention is based on the creation date of the file. The sync client sends the original creation date to the server, while uploading through the web interface will create a new file with a new creation date. We hope to be able to add a upload date to the filesystem soon, which would make more sense. Until then this potentially unexpected behavior has to be taken into account.

is there a work around about this behavior?
my files are tagged correctly but they cannot be deleted.
moreover it is possible to know which are the next files to be deleted?
also by from cli ?