nginx printed this

client intended to send too large body: 2097152 bytes

What it meansA client tried to upload a request body larger than client_max_body_size, which defaults to 1 MB, so nginx rejected it with a 413.

The first thing to checkIncrease client_max_body_size in the http, server, or location block, for example to 10m, then reload nginx; also check upload limits in your app.