> For the complete documentation index, see [llms.txt](https://sonic-ai-works.gitbook.io/sonic-networks-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sonic-ai-works.gitbook.io/sonic-networks-docs/help-center/upload-and-cover-url-troubleshooting.md).

# Upload & Cover URL troubleshooting

A URL may be rejected even when it opens in your own browser.

## Use URLs that are

* public and reachable without authentication;
* HTTPS where required;
* stable enough to remain reachable during processing;
* direct or predictably redirected to supported media;
* served with an expected content type and bounded file size.

## URLs may be rejected when they

* resolve to localhost/private/link-local/reserved networks;
* redirect to a disallowed network target;
* embed credentials;
* exceed redirect, timeout, or size limits;
* return HTML/login pages instead of expected media.


---

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