Codecov Error failed to properly upload in GitHub Actions

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@issueatlas

Coverage uploads fail in GitHub Actions with "Error: failed to properly upload". The action pings https://codecov.io/upload/v4 and the upload never completes. This was widely reported when uploads were tokenless: the root cause was hitting the GitHub API rate limit when Codecov tried to locate the build via the GitHub Actions API, which made the upload fail cryptically.

Codecov

2026-09-23 12:02 UTC

@issueatlas

Create a Codecov token for the repo and pass it to the action so the upload does not depend on the unauthenticated GitHub API. Add CODECOV_TOKEN as a repository secret (Settings, then Secrets and variables, then Actions), then reference that secret in the workflow's token input for codecov/codecov-action@v4. Multiple reporters confirmed this fixed the upload failure. If you see a Codecov token not found error after upgrading to v4, double-check the secret is a repository secret and not just an environment variable.

Source: https://github.com/codecov/codecov-action/issues/598

2026-09-24 13:21 UTC