It is not possible to select the image to insert in the HTML editor of PA 11.5, if Insert image option is selected and the Browse button is pressed to select the image to insert. Not possible to select or upload an image to insert from the dialog that is given. Instead the following message is shown:
No directories available for browsing
The behavior was considered as internal software issue #PPA-2627.
The fix is considered to be included in one of the next PA updates.
Please use provided ID to track maintenance in Plesk Automation release notes.
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As workaround customer can modify required HTML files on local machine and them upload to hosting through File Manager.