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The Firewall setting : file_upload Malicious File Upload (Patterns)
is causing users with a custom role (created via User role Editor), to experience http error on attempting to upload files smaller than our limit of 16 Mb.
Possibly related to these issues:
https://wordpress.org/support/topic/http-error-issues/
https://wordpress.org/support/topic/firewall-malicious-file-upload-php-blocking-users-from-uploading-images/