I guess, before criticising Samsung for everything, you should troubleshoot the issue yourself and atleast download an app which can open your "ppt".Note: Before posting anything, check your spellings.

I keep my Ram Plus on and at half of my actual Ram which is 8 Gb. I do notice significant stability when Ram Plus is off, the phone runs a bit faster in my opinion. Ram Plus do cause minor stutters while switching between different apps. I personally...

I have faced the same issue on my F55 but when I diagnosed the issue it belongs to the sim company. I switcher from jio to airtel and the problem solved. This issue is annoying not gonna lie.