Re-requesting failed thumbnails doesn't work on IE11. When thumbnailing large files, it's apparently expected that generating the thumbnail can take longer than various timeouts. We have code to retry several times, but it's not kicking in on IE 11.
- Mentioned In
- T126293: Cannot upload 12MB JPG file with Upload Wizard: "The upload succeeded, but the server could not get a preview thumbnail."
T130238: API "async" upload treats all stashed files as empty (Unknown warning "emptyfile, stashfailed" in UploadWizard for files over 10 MB)
T130204: Special:UploadStash thumbnails failing to generate with 500 & 503