See the status code yourself
curl -sS -o /dev/null -w '%{http_code}\n' https://example.com/pathAdd -v to see the full request and response headers.
HTTP 413 Content Too Large
The request body is larger than the server allows.
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- Code
413- Name
- Content Too Large
- Category
- 4xx — Client error
How to fix / what to check
In nginx raise client_max_body_size; in PHP raise upload_max_filesize and post_max_size.