I'm trying to implement post grid for tags on the GeneratePress theme. There is no tags.php file in the theme. Could you download the free theme and tell me what file I need to update? It would be helpful if your documentation included instructions for many popular themes as Generatepress is one of the top themes now.
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Thanks for your post,
I just check GeneratePress, i can see there are using archive.php file to generate tags page.
I can see there is not action hook to inject post grid shortcode inside archive.php
In this case you will need to copy archive.php file and rename tag.php and repalce loop by post grid shortcode.
Please see the screenshot
Please see the tag.php file