Tired in 2 separate installs of vanilla 2.3 magento commerce.
When trying to update favicon and logo and transnational email logo, the upload spinner will appear but are not saved.
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File path : /vendor/magento/module-theme/view/adminhtml/ui_component/design_config_form.xml
Find and replace :
<field name="header_logo_src" formElement="fileUploader"> To <field name="header_logo_src" formElement="imageUploader"> <field name="head_shortcut_icon" formElement="fileUploader"> To <field name="head_shortcut_icon" formElement="imageUploader">
this is a known bug in 2.3.0, there is already a fix for it in the repo - you can see the fix here which you can apply manually for now. It will be released in 2.3.1
same problem with magento 2.3.1 and the fix it is already added.