Fix · Forms and email

File upload in the form fails (413 Payload Too Large)

What you may see

Big photos or files fail to upload

Most likely cause

The host or server limits the size of one request, and phone photos are often large.

Check first (about two minutes)

Try a small file: does it work?

The fix prompt

What you type here never leaves your browser. The search runs on this page, and nothing is sent to a server or to an AI.

The exact error or what you see

What you did before it happened

Kept only in this browser, on this device. Keys and passwords are removed before anything is saved.

Prompt language

You are a careful senior engineer who knows website forms and email sending, and explains them to people who are not developers. I am not a developer, so explain every step in plain words and tell me exactly which button, menu or command you mean. If you are not sure about something, say so; do not guess.

THE PROBLEM
File upload in the form fails (413 Payload Too Large)

THE EXACT ERROR OR WHAT I SEE
[paste the exact error here]

WHAT I DID BEFORE IT HAPPENED
[write in a few words what you did before it happened]

MOST LIKELY CAUSE
The host or server limits the size of one request, and phone photos are often large.

DO THESE STEPS, IN THIS ORDER
1. Find the size limit of the upload route and the host.
2. Shrink images in the browser before sending, show the allowed size and types, and upload large files straight to storage with a short-lived upload address instead of through the website server.
Stop and tell me if what you see does not match a step. Do not skip ahead.

CHECK THAT IT WORKED
- A normal phone photo uploads and a too-large or wrong type file shows a clear message.
Tell me exactly what I should see on the screen when it works.

DO NOT CHANGE
- Do not accept any file type.
- Anything I did not ask about: the design, the text, other pages, other settings or the data.
- Do not delete files, data or branches, do not reset or force-push, and do not rewrite history, unless you first show me exactly what would be lost and I say yes.
- Do not paste, print or ask me to paste a password or secret key into this chat. If one is needed, tell me which settings page of the right service to store it in.

WHEN YOU FINISH
Explain in simple words what you changed (file by file or setting by setting), why you changed it, and how I can undo it.

Paste it into Claude, ChatGPT, Gemini or Cursor, then follow what it says.

After you tried it, did it work?

Steps

Find the size limit of the upload route and the host.
Shrink images in the browser before sending, show the allowed size and types, and upload large files straight to storage with a short-lived upload address instead of through the website server.

Do not do this

Do not raise the limit very high on the main server.
Do not accept any file type.

Fix it File upload to Supabase Storage fails

Try another entry