This article summarizes the most common issues you’re likely to encounter when using Claude: messages failing to send, replies being interrupted, attachment uploads failing, and account risk-control warnings. For each issue, it provides a practical troubleshooting sequence. Following the steps usually restores Claude to normal quickly.
How to handle message send failures or interrupted replies
When Claude shows a send failure, first refresh the page and reopen the same conversation, then resend your last message; often it’s just a temporary connection fluctuation. If Claude interrupts frequently, split long questions into two or three parts, and reduce pasting large blocks of text at once—stability will improve noticeably.
If Claude keeps getting stuck on “Generating” on the same network, try an incognito window or switch browsers first, to rule out browser extensions blocking scripts. If it still doesn’t work, clear the site cache and cookies and then log back into Claude—this is often more effective than repeatedly refreshing.
Claude attachment upload failures or incomplete parsing
If Claude fails to upload a file, first confirm the file format is an allowed type in the interface and check whether the file is too large; different entry points may have different size and format limits. To improve Claude’s parsing success rate, for scanned PDFs it’s recommended to run OCR first or convert them into copyable text before uploading for Claude to read.
If Claude can upload the file but can’t read it fully, it’s usually because the document structure is complex or the content is too long. You can export key chapters into smaller files, or explicitly tell Claude in your message to “list the table of contents and the missing sections first,” then upload additional parts section by section.
