When uploading files to the scratchpad (the attachment area for files you give Claude), fonts are now recognized as their own file category based on extension or content type. Fonts get their own byte-size and file-count limits (rejecting uploads with more than a set number of fonts), separate from the existing 8MB-per-file and total file-count caps that already applied to other files.
Uploads are also now checked for name collisions that differ only by letter case (after normalizing the filename); a file with the same name as an existing one except for capitalization is rejected.
This prevents font uploads from silently exceeding size budgets meant for other file types, and stops uploads from creating two files whose names differ only by case, which can cause confusion or conflicts on case-insensitive filesystems.