Hi thanks for you reply and sorry I should have marked this as solved – Mike sent me a private reply which solved it.
I am afraid that from our end, we can be of much assistance as this depends on the user’s capability role and not the ACF side as the code is controlled from the WP end but not the ACF side.
To test that out, you can allow the subscriber user to add an image to the gallery and try uploading from the back-end without using ACF and you will notice that the subscriber user cannot make changes to the alt, title, description, as well as the caption text.
..you can make use of the user editor role plugin, to enable the subscriber upload_files, edit_post, as well as edit_published_posts, then amend your code to take care of the subscriber and you would be in a position to change the caption or alt tags.
That said, please have a look at the following screencast on the same: https://www.loom.com/share/4cb6bc1124c1402284384061e19d4768
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