Drupal stores images in:
Would it be better if I instead could find a way to have:
Is there any way to know for sure this is or is not a factor?
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It is absolutely okay that Drupal stores images in such a directory. While the filename should be descriptive, the
alt attribute is more important for SEO. The name of the directory images are stored in is of very low importance.
You can read about Google's image publishing guidelines here.