Bulk Edit: Copy TITLE to ALT field for multiple media items in Media Library

✅ Solution:

1. Media → Assistant → Select media items to process → Bulk Edit.
2. Fill the “ALT Text” field like this:  template:[+post_title+]
3. Click the UPDATE button to process your selected items.

After the progress click REFRESH so that your recently processed items show up in the table below. You will see that their TITLE was copied to their ALT text.