When making new names there is a chance of two files ending up with the same name. The default behavior is to fail and not rename the file but you can change this behavior by applying a different name collison rule. The 4 rules are described below.
Don't let Advanced Renamer rename files with a name collision. This is the default behavior.
Append incrementing number
Will append a incrementing number grouped by similar filenames. If the resulting new names are as follows:
The resulting names will be:
Append image sub second
Will append the Exif value Image Sub Second (if present) to files with the same name.
When using this collison rule a text box will allow you to supply a pattern containing tags that should be applied to the end of all files with a collision.