I have changed the select dropdown to multi-select dropdown. I did the same in the database as mentioned below.

UPDATE `eav_attribute` SET `backend_model`="Magento\\Eav\\Model\\Entity\\Attribute\\Backend\\ArrayBackend",`backend_type`="varchar",`frontend_input`="multiselect", `source_model`=NULL WHERE `attribute_id`=YOUR_ATTRIBUTE_ID_INTEGER LIMIT 1

But the multi-select attribute saving only one value, not multiple values.

  • Normally, multiselect should have backend_type = 'int' – Yash Patadia Mar 26 at 6:11

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