Damn. No, unfortunately I just tried to upload 5 different images, (jpegs, PNGs, etc) and they all failed. Same error got thrown:
Could not open lock file for "mwstore://local-backend/local-public/ArylonCOA.png". Make sure your upload directory is configured correctly and your web server has permission to write to that directory. See
https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:$wgUploadDirectory for more information.
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Alas...
