Thread:Project:Support desk/jpg upload issue across all wikis/reply (3)

PDF don't generate thumbnails (usually), but JPG, PNG and GIF fimages do, and they're handled by MediaWiki. That's most probably the explanation as of why PDF files upload just fine.

If your image is big, it may be a problem with the thumbnailer, that consumes too much memory while creating the standar thumbnail that's shown on the file description page, or if it takes a lot of time to complete the operation it may be killed by the server.

If the problem is the particular image, try uploading a smaller one and see if it goes through. If not, the problem may be more general.

To figure out what's happening, I'd recommend to set up a debug log as explained in Manual:How to debug just before uploading the file. You can then compare it to the debug log of uploading a PDF file. If you can't figure out what's happening, you can post here your debug log (put it between   tags if possible), only for the request that's performing the upload.