So what appears to have happened is that the file that is uploaded has the same modification time as the local file.
I think this is the same problem as Files already synced are being (supposedly) synced again which we haven’t got to the bottom of but we suspect something to do with dropbbox and versions.
So what will be uploaded is an old file version with the new modification time. Is that possible?
If you download the FICHAS 2016.xls file can you check to see if it is corrupted and if it is an older version?
@TowerBR any thoughts to add?