Amazon Photos does not provide a way to export all of your photos and videos, or even albums, with a single click.
According to their help desk article, you have to select and download photos individually.
Once you've downloaded your photos, simply drag and drop this folder into our desktop app, and Srarna will take care of the rest.
Note: If your uploads get interrupted, just drag and drop the folder into the same album again, and Srarna will ignore already backed up files and upload only the remaining ones.
If you encounter any issues during this migration, please reach out to support@srarna.com and we will be happy to assist you!