I’m currently using the Post Object (on a page) for the user to choose from the available posts so they can be rendered onto that particular page. However, rather than just a list of all posts I would like the user to be able to choose (and see) only posts with a particular tag.
Is this possible? I have the pro version
What version of ACF are you using, after my last comment I had to go look to be sure but ACF lets you filter the posts by a specific term when creating the field.
Or you mean that you want them to select the tag… for that you need to use a relationship field which will show filter options.