How do I safely add or overwrite product images using the PicManager app?

How do I safely add or overwrite product images using the PicManager app?

To add new images without replacing existing ones, select the "Add to an existing image gallery" option in the upload strategy after successfully matching your images. This will keep your current product images intact while adding the new ones: 

To replace current images, select 'Replace existing product images' after your upload. You can always restore the original images at any time via the History page