Fix upload issue in 2.2.5 by adding file and mime types #15
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Magento 2.2.5 adds a mime type check in the uploadFile method in Magento/Cms/Model/Wysiwyg/Images/Storage.php
If the mime type check fails the upload is aborted, giving the error message ”File validation failed.”
The allowed mime types are defined in Magento/Cms/etc/di.xml
So, we need to add file and mime types we want to support to the allowed and image_allowed arrays in di.xml.