Select component with ->multiple() method

I have this code

Forms\Components\Select::make('instrument_id')
   ->multiple()
   ->relationship('instruments', 'instruments.name')
   ->searchable()
   ->preload(),

Forms\Components\Select::make('instrument_id')
   ->multiple()
   ->relationship('instruments', 'instruments.name')
   ->searchable()
   ->preload(),

Forms\Components\Select::make('instrument_id')
   ->multiple()
   ->relationship('instruments', 'instruments.name')
   ->searchable()
   ->preload(),

Forms\Components\Select::make('instrument_id')
   ->multiple()
   ->relationship('instruments', 'instruments.name')
   ->searchable()
   ->preload(),

It has a

belongsToMany

belongsToMany

belongsToMany

belongsToMany relationship

instruments

instruments

instruments

instruments, upon submission, I can't get the value of

instrument_id

instrument_id

instrument_id

instrument_id but when I removed the

multiple()

multiple()

multiple()

multiple() method that's the time

instrument_id

instrument_id

instrument_id

instrument_id has value

Do you know how can I get the value when using

multiple()

multiple()

multiple()

multiple() method?