The access hole on the trim oil reservoir seems to be blocked by the casing of the motor as seen below.
It is impossible to open trust me. I unscrewed a bolt on the lower end of the casing as shown below (the smaller wet bolt).
I'm pretty sure it was the drain hole, but I didn't know what else to try. There's no way the outboard casing actually blocks the trim oil hole, right?!?! I feel like I am missing something and humbly appreciate all advice. Sorry I don't have better pictures, but trust me there is no other things that unscrew on the motor or piston casing. Thanks!

It is impossible to open trust me. I unscrewed a bolt on the lower end of the casing as shown below (the smaller wet bolt).

I'm pretty sure it was the drain hole, but I didn't know what else to try. There's no way the outboard casing actually blocks the trim oil hole, right?!?! I feel like I am missing something and humbly appreciate all advice. Sorry I don't have better pictures, but trust me there is no other things that unscrew on the motor or piston casing. Thanks!