From your servers phpinfo file. It shows loading/using the following .ini file for php config:
|Loaded Configuration File||/etc/php7.ini.d/php.ini|
That's not the same file as your php.ini is it?
In the phpinfo file:
And according to the error you shared, the web based upgrade needed about 1.2 Megs more memory.
I take it you shared that same error information with provider?
'spirit of sharing', Ken