Thank you for the additional information. It is the third party application that you’re using to upload via WebDAV that must provide the file timestamps. It’s likely that this information is not being supplied upon upload. You would need to contact Synology directly as this is something we cannot control unfortunately.
Hi cpcnw, unfortunately if you go to Cloud Sync or this link directly and scroll all of the way to the bottom you will find WebDav does not support last modified time. Why in the world an application would take that approach is behind me. Possibly, it is the print.
However, Icedrive needs to establish a relationship with key NAS providers (i.e. synology) and get added to the list of supported providers. That is in Icedrive’s hands to support this community. Other key providers have done so.
Otherwise, WebDav is useles if you use Cloud Synch. Possibly there is another container app. I suggest posting on the Synology NAS forum. Others have complained.