We've added a feature to merge datasets (with annotations) together in just a few clicks.
Hover your mouse on the three dots on the right side of one of the datasets you wish to include the merged dataset. Click the highlighted button (three horizontal dots), and select "Merge Datasets."
Select the datasets you wish to merge by clicking the checkboxes on the right side of each dataset.
Click "Merge Datasets" in the upper-right corner.
Name your new dataset and new annotation group click "Merge Datasets."
NOTE: The merged dataset will contain the images (and any associated annotations) present at the time of merging.
In addition to the merged dataset, you retain the original datasets. In the above example, there are three datasets: the two originals and the newly merged dataset.
The best part is, because the merged dataset consists of copies of other photos, you aren't charged for extra images!