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The error names the exact cause: a size limit, an unsupported format, or a mapping issue. Check the limits (images 20 MB, audio 100 MB, video 500 MB) and, for video, re-export as MP4 with H.264 video and AAC audio:
Credits ran out or a spend cap was hit. Top up in Billing and credits or raise the cap, then select Resume collection in Setup & collect.
Setup & collect lists the readiness checks that failed, each with a fix. The common ones: fewer than two outputs, outputs missing a prompt value, or no prompt with outputs from two different candidates.
API keys require a Pro, Team, or Enterprise workspace, and in team workspaces only Owners and Admins manage them. Keys live under Account settings → Security & API.
Creating evaluations and importing data need a tablet or desktop. Phones support voting, monitoring, results, exports, and account management.
Still stuck? Contact support. Include the trace ID from the error if one is shown; it lets us find your exact request. Never include API keys or private media URLs in a support message.