Upload stash seems to fail for paged media (pdf's is what i tested. But same issue presumably applies to other paged formats like Djvu, and other "weird" formats like ogg most likely).

This seems to be because SpecialUploadStash only accounts for width parameters to be at the begining of the thumbnail name. It doesn't look for a page parameter. Handler's can define there own parameter, so this would also break for things like oggHandler, which can have a seek parameter for where in the video the image was pulled from.

As a secondary issue, UploadStash doesn't support files with multiple extensions (key is not in proper format...), which happens for pdf's (And some other non-image formats) since the thumbnail is jpg, but the original is pdf. so the filename of a thumb ends up being page1-100px-foo.pdf.jpg

Version: 1.18.x
Severity: minor