Idea: Does the Dropbox app on PR2100 use client_modified timestamp in Dropbox API v2? File modification time is not preserved and needs to be preserved when uploading to Dropbox

I’m finding that the modified time for files set to sync (upload) to Dropbox with Dropbox via the Dropbox app configuration are not preserved and are changed to the current time (the time they were uploaded to the server). This occurs both on the client and the server. It would be great if the modification time could be preserved. To clarify, I have copied these files from an external drive and the modification time was preserved when I copied the files from the external drive to the NAS via the share in the Windows file explorer, it is just not preserved when the folder is synced with Dropbox.