Increase upload body size limit to 500MB to prevent silent upload failures

[x0x0b]

Summary

Increase bodySizeLimit and middlewareClientMaxBodySize from 100MB to 500MB.

Background / Problem

When attempting to add multiple images whose total size exceeds 100MB on the Datasets screen, the upload fails silently.

• No error is shown in the UI
• Images are not added successfully
• The console logs the following errors:

[UI] Request body exceeded 100MB for /api/datasets/upload. Only the first 100MB will be available unless configured. See https://nextjs.org/docs/app/api-reference/config/next-config-js/middlewareClientMaxBodySize for more details.
[UI] Upload error: TypeError: Failed to parse body as FormData.
[UI]     at async y (R:\StabilityMatrix\Data\Packages\AI-Toolkit\ui\.next\server\app\api\datasets\upload\route.js:1:1736)
[UI]     at async k (R:\StabilityMatrix\Data\Packages\AI-Toolkit\ui\.next\server\app\api\datasets\upload\route.js:1:5035)

This behavior is caused by the request body being truncated at the default 100MB limit, which results in invalid FormData being parsed on the server.

Changes

• Increased bodySizeLimit
• Increased middlewareClientMaxBodySize
• New limit: 500MB

Rationale

Assuming:

• 1 PNG image ≈ 2MB

The new limit allows uploading approximately 250 images in a single request, which aligns better with practical dataset creation workflows.

Impact

• Prevents silent upload failures on the Datasets screen
• Improves reliability when uploading large batches of images
• No behavioral changes for uploads under the previous 100MB limit

[JasonOdinberg]

Go to ui folder

Open next.config.ts

I think you can set this to any size you want, 2gb works for me.