SSD upgrade and Battery for Dell Inspiron 2-in-1 Touchscreen 17, 7773

Hi all Tech gurus

I request you to kindly suggest me the best upgrade solution:

I wish to upgrade internal storage of my  Dell Inspiron 2-in-1 Touchscreen 17" 7773 to 2 TB (or 4 TB if possible) SSD. 

The specifications of my system are:

• Memory: 16 GB
• Processor: Intel(R) Core(TM) i7-8550U CPU @1.80GHz[Cores 4] [Logical processors 8].
• Operating System: Microsoft Windows 11 Home.

The original battery is dead, I have to plugin the power to be able to use it. I need the original or best compatible battery.

I live in Europe so I can purchase the upgrade products from www.amazon.nl  or Western Digital or any other brand in the region.

Can the Memory be upgraded to 32 GB?  Only if it has been tested and found working well.

Can the system take NVMe SSD with or without housing?  

Thanks for your help.

S K