dpgaspar commented on issue #10022:
URL: 
https://github.com/apache/incubator-superset/issues/10022#issuecomment-641249971


   Hi @AshishKapoor,
   
   Thumbnails need cache and celery workers, take a look at: 
https://apache-superset.readthedocs.io/en/0.36/installation.html#celery-tasks
   
   Also on celery use: `CELERY_IMPORTS = ("superset.sql_lab", 
"superset.tasks.thumbnails")`
   


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