I’ve tried asking on the Mediawiki Support Desk but haven’t gotten any help.
EDIT: It looks like the issue with images comes from using Short URLs. After uploading the image through the Upload File section I get a 404 error but if I add /index.php?title= to the url I can visit the uploaded files. Not sure how to fix this though
So basically my issue is mediawiki thinks the links to my files are /File:filename.png but they’re actually at index.php?title=File:filename.png
What info do you need? The error seems to be due to the Short Urls feature. If I go to the Upload File section and upload a file it redirects to the file but gives a 404 message but when I go to the list of uploaded files I can see all the files have actually uploaded.