I found this in a community forum and it finally worked. Thanks.
1. Go to Online Store->Theme->Edit code
2. Asset->Add new asset (as logo.svg)
then go to header.liquid
search below code
<img src="{{ section.settings.logo | img_url: image_size }}"
srcset="{{ section.settings.logo | img_url: image_size }} 1x, {{ section.settings.logo | img_url: image_size, scale: 2 }} 2x"
alt="{{ section.settings.logo.alt | default: shop.name }}"
itemprop="logo">Replace with this
<img src="{{ 'logo.svg' | asset_url }}" alt="{{ shop.name }}" itemprop="logo">
