Can't solder this component, any ideas?

Hi, im new in the micro soldering, so any advice you can tell me is good for me.

I have an iPhone with battery pry damage, already solder successfully Q3 and U3, but i couldn't solder the capacitor C285 (i take the capacitor from a donor logic board).

I have tried many times, but don't kept welded. Im using the next things:

MG Chemicals 8341 No Clean Flux Paste

MG Chemicals 4860P-35G Solder Paste, Sn63/Pb37

Soldering Iron Aoyue, Bevel tip (using 350 Celsius)

Remember that im new in this topic. Please explain me with details.

Which could be the problem?

Thank you.