Recent switchover to HTTPS protocol for Flickr is throwing errors not only for FlickreviewR bot but also for Special:Upload (and possibly UploadWizard but I haven't checked yet). Specifically when inputting an HTTPS URL into the "Original source" field this error pops up:
The source must be a URL pointing to the image description at Flickr.
Version: 1.23.0
Severity: enhancement
URL: https://commons.wikimedia.org/w/index.php?title=Special:Upload&uselang=fromflickr