What does the Sync Items button do?

This button will sync your current eBay item data to your 3Dsellers database.
If you make changes with eBay's website or an application other than 3Dsellers, use the Sync button to update your 3Dsellers account.
After syncing your items, all listings in the Listings Manager, Listing Designer, and Image Editor will be updated with live data from eBay.
You do not need to sync for automated features or after using 3Dsellers to make changes to your listings.
Pro Tip: We recommend syncing your items periodically and before exporting "Listings - from 3Dsellers."
Sync Timestamp
The timestamp of your last sync is displayed next to each Sync button.
If it has been more than 24 hours since you've synced your items, the timestamp will display red:

What does my 3Dsellers database do?
Your 3Dsellers account includes a database of your eBay item information.
This is used to quickly retrieve item information without waiting on eBay's API.
It also used for other features within the platform (such as a custom report type).
Additionally, your database is a static backup of much of your listing data.