I'm on Calibre 5.8.1. I downloaded davidfor's python3 version Sum Column-beta-py3.zip.
I'd like to use the plugin to add up the filesizes, as shown in the column titled "Size (MB)". But when I try to configure the app, it's not an option. The only option in the Configure window is "Read Percent".
Why can't I use this plugin to add up the numbers in the Size column?
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