The first thing you should do is look through our guide on fixing syncing issues. Many of the most common problems can be resolved there.
Syncing Product and Collection single pages may take up to 5 minutes depending on the size of your store and speed of your internet connection. If you have over 1000 products you can expect the sync to take around 5-10 minutes. We’re actively working to make this better.
Under the plugin settings, you can try changing the “Items per Request” option to 25, and turn on “Synchronous Requests”. After these are updated try re-syncing again.
Finally, take a look at our syncing tutorial video.