Problem: Making Custom Author Fields Show Up on Author Profile Pages etc
Solution: To get the currently displayed author ID of author profile page, you will require to write a custom shortcode that returns the current author profile ID.
You can find the proposed solution in this case with the following reply: https://toolset.com/forums/topic/making-custom-author-fields-show-up-on-author-profile-pages-etc/#post-1787391
Relevant Documentation: => https://toolset.com/documentation/programmer-reference/views/views-shortcodes/#vf-154505
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