#StackBounty: #admin-panel #magento2.3 #php-7.2 Magento 2.3.0 "A technical problem with the server created an error." When up…

Bounty: 50

I’m using Magento 2.3.0, with php 7.2 version, on a ubuntu os.
Everything looks working fine, but when I try to go into Magento backend, Content – Design/Configuration – Header, and I try to upload the logo image, I get this:

A technical problem with the server created an error. Try again to continue what you were doing. If the problem persists, try again later.

I have tried already to change the user password, to check the index.php for any echo code, tried also to upgrade, compile, deploy, reindex, clean cache, but nothing, I still get this error..

Get this bounty!!!

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