To change the logo of your website with HTTPS implementation, please follow the below steps :
Login to your PushCrew dashboard.
Click on Settings - Smart Code - Update Information
It will give you the option to change Website Logo. Click on ‘Change Logo’ and select the file you want to upload.
Download the new image and upload it to the root directory (/) of your domain as well. Your new logo will only start showing in notifications after it has been uploaded.