You can add images to your batch at any time by using the Add images feature in the Batch Editor.
Availability:
Batch is available on all paid plans (Pro, Max, Ultra).
Steps (Android)
To add extra images to a batch:
Create a batch of images or select Batch and then Resume previous batch.
Select the context menu ( ... ) at the top.
Select + Add images and select the images you want to include.
Related articles
Delete images in a batch (Android)
Edit multiple images at once in Batch - workflow (Android)