Replace media files with the same name, instead of adding _1.
After installing the module, clear the cache and edit the form settings for media. Enable the Replace file field (place it under the file upload).
Drupal adds _1 to uploaded files to preserve references to the old files in revisions.
The changed file name also fixes caching issues, where a user may have the old version in their browser cache and not see the update until it expires.
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