rclone sync checking date and time not size

Hi! I'm trying to sync a local filder with a remote folder on Mega. Copy is working but if Imodify some character in a file (by example fro S1E1 to S1E2) it doesn't sinc since the size is unchanged. Other than using copy how can I sync using date and time and not size? The flag --ignore-size apparenty is not a solution. Thanks in advance for any help