To edit multiple images at once, you need to create a batch. You can then use the Batch editor to make the changes.
Steps (Android)
To create a batch of images:
Select the Space you want to work in.
Select Batch.
Select Start new batch.
Alternatively, select Resume previous batch to continue with your last batch. Photoroom opens it in the Batch editor, and you can skip the remaining steps.
Select the images you want to include in your batch and select the checkmark icon to confirm.
Photoroom creates your batch and each image keeps its original background.
You have now created a batch. The images appear in a grid in the Batch editor, You can use the Batch editor features to make changes, such as add text and graphics. For details, see How to edit a batch of images - workflow (Android).
When you have finished editing
We strongly recommend that you download any batch images that you want to keep, as they may be lost when you exit the editor. You can then use the downloaded image files in other applications
Be aware that Photoroom:
Does not save batch images as designs
You won't find batch images saved as designs in your Content. To save batch images as designs, you need to download them and then import them as new designs. For details, see Save batch images as designs.
Can automatically save your batch as a project that you can reload later.
This requires the Save & Sync feature, which is not available to everyone yet. To learn more, see Save & Sync for batches.
May be able to restore the last batch you worked on (iOS and Android only).
When you select Batch, if you see a Resume previous batch option, you can load the last batch.