Claude FAQ: Invalid login emails, request rate limiting, and attachment upload failures

This Claude FAQ focuses on the most common things that tend to get users stuck: login verification, failed message sending, rate-limit warnings, and attachment upload issues. Follow the troubleshooting steps below, and in most cases you can get Claude working normally again without switching accounts.

Can’t log in to Claude: expired email links and being repeatedly redirected back to the login page

Claude commonly uses email verification for login. If you click the link in the email and it says it has expired, simply go back to the Claude login page and request a new verification email. In many cases, the link becomes invalid because it was opened in an old tab, or it was left open too long before being clicked. It’s recommended to complete verification immediately after receiving the email in the same browser.

If Claude keeps redirecting you back to the login page, first check whether your browser is blocking cookies or has strict privacy mode enabled. Add claude.ai to the allowlist, temporarily disable ad-blocking extensions, then refresh and log in again—this often allows the session to be written successfully.

Claude send failures: network errors, interrupted requests, and queuing

If Claude shows “Unable to complete request / network error,” don’t repeatedly hammer the Send button. Wait a few dozen seconds and try again, or shorten the same content and resend it—when the network is unstable, Claude is more likely to be interrupted by long inputs.

If you suspect server-side instability, check Anthropic’s status page (status.anthropic.com) to confirm whether Claude is experiencing an outage. If there’s no outage, switching networks (for example, from Wi‑Fi to a mobile hotspot) is usually more effective than refreshing repeatedly.

Claude rate-limit warnings: what to do if messages are too frequent or the context is too long

Claude rate limits are usually triggered by too many requests in a short period, or by a conversation context growing very long and increasing processing cost. The most reliable approach is to pause for a few minutes, then continue, and split your question into two or three separate messages to send to Claude.

If a conversation has accumulated a lot of history, it’s recommended to start a new chat and begin with a short summary, pasting in the key background before asking your question. This both reduces Claude’s load and makes it easier to avoid triggering rate limits again.

Claude attachment upload failures: the button does nothing or the file can’t be parsed

If Claude’s upload button is present but uploads fail, first rule out issues with the file itself: switch to a more common format (such as PDF or standard image formats), reduce the file size, and rename the file using only English letters and numbers before trying again. Another frequent cause is browser extensions blocking upload requests—turning off blocking-type extensions and reopening Claude to retry is often the quickest path.

If Claude shows “Unable to read/parse,” it may not be user error; the file content may be too complex (scanned documents, encrypted PDFs, very long tables). You can export the key pages as images or copy the key passages as plain text for Claude to process instead, which significantly improves the success rate.