Claude FAQ: Login Restrictions, Conversation Interruptions, and Attachment Uploads

When using Claude, the most maddening thing is often not being unable to write content, but login restrictions, conversations suddenly getting interrupted, or attachments failing to upload. Below is a Claude FAQ organized by high-frequency scenarios, aiming to pinpoint issues in a “can act immediately” way. When you run into similar situations, you can troubleshoot in order—usually without too much hassle.

1. What to do if you can’t log in to Claude or it says access is restricted

If Claude keeps spinning, shows a blank page, or says access is restricted, first try your browser’s incognito/private mode, then temporarily disable ad blockers, script managers, and privacy-protection extensions. Many Claude login issues aren’t account-related—extensions may be blocking login redirects or verification scripts.

Next, check whether your network environment is stable, and try to avoid corporate intranets, public Wi‑Fi, or network routes layered with “multiple proxies.” Claude is more sensitive to abnormal login environments. If you encounter repeated logins or are repeatedly asked to re-verify, staying on the same device + the same network for a while usually improves the success rate.

2. What to do if you can’t receive the verification code or verification keeps failing

If you can’t receive the verification code, first confirm whether your email has sorted the message into “Spam/Promotions/Subscriptions,” and search by keywords rather than only checking the inbox. If the page allows resending, wait a few minutes before trying again—repeated clicks may trigger rate limits and make it even harder to receive.

If Claude says verification failed or the link has expired, common causes include opening an old email, an old tab, or trying to log in on multiple devices at the same time. Close all Claude login pages, keep only one window, request a new code, and complete verification within the same browser—this can significantly reduce repeated failures.

3. Conversation interrupted, messages won’t send, or results are incomplete

If a Claude conversation is interrupted, first copy your input locally, then try refreshing the page or sending again. If it often gets stuck on “Sending,” split a long input into two or three parts—provide background and goals first, then materials and constraints. Claude is usually more stable this way.

When Claude’s output is incomplete or stops abruptly, don’t rush to start a new topic. First use clear instructions such as “Continue / continue from the previous step / resume from point X” to fill in the missing parts. If that still doesn’t work, the current conversation state may be abnormal—start a new chat and paste in the key context, which is often more time-saving than retrying repeatedly.

4. How to troubleshoot attachment upload failures and parsing errors

If Claude fails to upload an attachment, first confirm the file isn’t in use (e.g., currently open in WPS/Office), then try “Save As” with a new filename and upload again. You can also convert the file to a more common format (such as PDF or plain text) and retry—many parsing failures are actually format-compatibility issues.

If Claude indicates insufficient permissions, can’t read the file, or shows parsing abnormalities, focus on two checks: whether the file contains encrypted/protected content, and whether the file size exceeds the limit indicated on the page. Consider splitting large files and keeping only the necessary chapters. After uploading, add a one-sentence instruction like “Please summarize the structure first, then analyze chapter by chapter,” which can reduce the chance of Claude misparsing.