Theme Upload failure

I’m trying to upload my Newsmag theme to wordpress and I keep on getting this error

what could be the real issue here?
Any help will be appreciated.
Thank you!

By the way, this is a wordpress installable file only in zip format. size is 7.9MB

You need to extend the limit with your hosting. Speak to your provider or follow steps here

Any idea how I can do this on Google cloud please?

Never tried with that- best option is probably to Google it

Can’t find anything on Google either!