Requests for features and bug report

Hello, thank you for this fantastic plugin! Using WordPress 5.5.1 and Version 1.8 of this plugin. I wanted to share some things below:

Requests for features

* Ability to add a second/third link button to the gallery and individual book pages (example. Amazon, Wikipedia etc.) — I’ve already done this manually in the code, but want to make sure my changes in aren’t reverted in future if I update the plugin
* Sort authors in search bar by alphabetical order just like how they are sorted alphabetically in categories
* Generate unique links to specific gallery views e.g. by category (not shortcodes, actual links)

Bugs

* When viewing books in categories, if there are multiple pages, clicking on page 2, 3 etc. takes one back to ‘all categories’