Error report as shown on Special:Upload
Chunked upload of TIFF file (106.7MB, Firefox on Ubuntu, from FAT) failed with an message "There was an error while uploading the file to stash".
Consider T38587, T61914, and T61917
Strangly enough, the file show up in Uploads after some time and seems to work.
Probably not tiff specific, just general issues with chunked upload being horrible.
It seems like it continue somehow if it is a single file, while it fails completely if there are several files.
Is this done, or is there still some remaining work?