FortiToken Logo appears very small on mobile

I have uploaded my company logo as per guide with size 320 x 320 in FortiAuthentocator > FortiToken.

But when it appears in mobile (android and ios), it appears very small and even can’t read any character. You can see in below picture that you can’t read anything and it doesn’t fit in full bottom screen of mobile.

https://community.fortinet.com/t5/image/serverpage/image-id/3956i080383336B198C3B/image-dimensions/586x782/is-moderation-mode/true?v=v2 

But you can see in below picture the default FORTINET logo fits full bottom screen and readable. I need to customize my company logo same like default.

https://play-lh.googleusercontent.com/nUeo1jFnSxV4RvVavsO1RNBP2Vqq2_lcjqY6IVYzbzI4nstqfBjQEf_lLeVitqyh8SA_=w2560-h1440-rw