The logo is the representative image of your online shop. This has to have the dimension of 220x100 and the format must be either PNG or JPG.
You have the possibility to add the logo from the Settings section > General > Identity > Logo
If you wish to add the image in the SVG format (standard formats are accepted), then the image must be uploaded from the design section > Configuration > General configurations > Website Identity
The logo uploaded from the Design section > Configuration > General configurations > Website Identity will have display priority.