While uploading a logo error like "header_logo_src does not contain field 'file'"

[Pranera]

Hi,

In Magento 2.3, While uploading a logo via Content->Configuration->Design->Edit->Header->Logo getting a error like "header_logo_src does not contain field 'file'" but already I have changed the file /vendor/magento/module-theme/view/adminhtml/ui_component/design_config_form.xml

 and changed "fileUploader" to "imageUploader". But still getting the error.

Here is a screenshot, kindly do needful.

 

[Kavitha Mano]

check with the correct theme file or else by overriding the xml file.

https://github.com/arshadpkm/magento-2.3-header-logo-upload-bug-fix

[technoswift]

i Had the same issue and could rectify using 

for Favicon and Logo : 

https://github.com/magento/magento2/commit/ba69bfec127bed8c39c7d9e7b73d10b54449b158

for transaction emails :

magento#20091

than i ran following commands on developer mode.

$ php <magento dir> bin/magento indexer:reindex

$ php <magento dir> bin/magento cache:clean

$ php <magento dir> bin/magento cache:flush

and things worked again