I am new in Xcode. This may sound silly.
Can Xcode upload the output only to the devices listed in the scheme list? For instance, uploading to iPad mini is not possible?
Xcode uploading
If by "upload the output" you mean build and run a project/app - which version Xcode are you using?
Xcode can build to any compatible, properly provisioned, connected devices as listed in the Member Center/Certificates, Identifiers & Profile/Devices. If you iPad mini isn't shown as available, there is a reason why, so begin by seeing what's different about it from your other devices that are listed.