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I'm having a User who don't have access to Sandbox, file storage or data storage. How can I provide access to these using Permission set
In Permission what needs to be enabled for this. Or is there any other solution for this.
You need to make this person as a User in sandbox first and then give him a profile and that would enable an access to several objects based on profile.
Permission set only comes into picture when any user needs an additional access on TOP OF their profile.
Hope it helps!