1. Case you used the exif variables: {YYYY}, {MM}, {DD}, {hh}, {mm}, {ss}, {make}, {model}, {lens}
The best case is renaming jpg file with exif data.
If the jpg file is lack of some variable like {lens}, the variable will be replaced with string of {lens}.
If your file does't exist exif data, this app won't modify your filename.
2. Case you just use the {sequence} variable
This app will rename all files unless the filename is conflict. So you'd better make sure you the {seqnence} is big enough to guarantee the uniqueness of the filename.
