If some photos share the same EXIF data, we will automatically generate serial numbers to avoid naming conflicts.
Q&A: Lack EXIF data
If some files lack EXIF data, we will use the created time as Date, And other fields will be replaced with placeholder. So you can rename any file, even if it's not an image file.
If you enable the EXIF mode in the settings, files without EXIF data will be ignored.