Questions about working in Gibraltar and living in Spain

I have a few questions about working in Gibraltar while living in Spain and would be grateful for any help.

Do you still have to do a tax return in Spain if you work in Gibraltar but reside in Spain?

Do people get their salary paid into a Spanish euro account or paid into a UK account and then transfer to a Spanish account themselves?

Can you open a bank account in Gibraltar as a non-resident?

Can you get your social security contributions transferred across into the Spanish system?  If so, how do you do this?

Thanks in advance

Sanchez1