Main features
Main window
Editing metadata values
Copying metadata
Auto-fill exposure number
Equipment library
General options
Metadata properties
Flickr compatibility
Editing metadata properties
User-defined metadata
AnalogExif XMP schema
Tag reference
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You have to select at least two images to use auto-fill exposure number operation. After you selected the necessary files and clicked Auto-fill exposure number you can review the numbers in the following dialog:

You can change the first exposure number and the other exposure numbers would be updated correspondingly. After you reviewed the exposure numbers, select OK to write the metadata.