The best option to use is php.ini but many coder or developer just don`t know how to teach other people very simple way of doing it, this is my second time of doing it and I can tell you where most of us are making the mistake.
Log into your root server where wordpress is installed and navigate to wp-admin folder and make sure to delete any php.ini file in that folder if any, then open your NOTE-PAD and paste the code below

memory_limit = 200M
upload_max_filesize = 200M
post_max_size = 200M
file_uploads = On

now save it as php.ini and upload it to your wp-admin folder, now you can check your wordpress to see the size limit

important note: php.ini must be in small letters like abcd and not ABCD that is you must save it with php.ini and not PHP.ini that is where most people where having problem, and if you which to change your size again, delete the file and create another one with the same process.

whatapps me on 08065942445

Noted