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Hi @shadialaghbari
I hope you are doing well today.
Smush fully supports Multisite installation. Note that, on WordPress Multisite networks, Bulk Smush is not available by default and needs to be enabled in the Network Admin under Smush > Settings > Permissions. Once it has been enabled, Bulk Smush will be available on the subsites.
Kind Regards,
Kris
Thanks, that works, but I would not have guessed that solution. It is better to simplify things for people.