Understanding early assignments on put credit spread

Hello.

This is my first spread and I am trying to learn & understand what happens if I get early assigned on the following PUT credit spread I sold.

Details of the trade:

• Sold vertical put credit spread on ZM. Long put = $55. Short put=$65. Expiration 7/19 eg 50 days away. ZM current price = $60.53

I believe I do understand these 2 potential outcomes of a put credit spread:

• BOTH puts are OTM before expiration: I can close and keep premium. Would close before expiration no matter what to avoid pin risk (moves after market close).
• BOTH puts are ITM. Max loss of spread. Bought long put exercised to put shares to someone else at long put strike price.

BUT what if I am early assigned in my trade above with long put OTM and short put ITM… 

Specifically my questions if early assigned:

• 1. Related to assignment part:
  • 1.1. even if Fidelity allowed me to sell the spread because I have the min collateral amount (eg $1000 here) – do I actually need the cash to cover the full assignment price of shares? 
  • 1.2. if I do not have the full amount to cover assignment, are the shares bought on margin and I am accrued interests temporarily?
• 1. Related to the bought long put ITM which is not expired: 
  • 2.1 If I have the full cash to cover assignment, I guess I can myself sell the shares at market price. And sell the long put for a few $ extra. Correct?
  • 2.2 If I do not have the full amount to cover assignment, does Fidelity automatically exercise the long put and I end up with max loss of spread? or do I get still the opportunity to sell the shares at market price?

Thank you