User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-29907434-20201231130221/@comment-1038387-20201231172829

Images can be renamed (moved) after upload, but the MassUpload feature does not offer the possibility to alter the filename upon uploading like Special:Upload does. It's drag and drop, as-is. On all image addition methods other than MassUpload, the old rules apply.