Summary
User discovered that using HttpApiSchema.Multipart to validate file uploads from an HTML form fails specifically when uploading macOS default screenshot files. The validation error indicates the 'photos' field is missing, which does not occur with normally named files like 'foo.png'. The root cause appears to be related to the filename format of macOS screenshots. This issue seems more related to platform behavior than schema implementation and will be reported to the project maintainer Tim. A related GitHub issue (#5321) and a reproducible example on effect.website were also shared.
Discord thread
https://discord.com/channels/795981131316985866/1480026590699327734