I read a lot about gatsby and picture plug-ins, but I don't know if I'm doing it right. I want to edit a theme because I can't post images with external url.

Only the image from the src folder etc. works.

Can someone tell you how to fix it? I am rather a beginner in graphql and react

post like this work:
---
title: "Ititle"
date: "2020-01-26"
thumbnail: ./img-22.png
description: "workin"
---

but i cant as thumbnail put image from external url like https://tumblr.com/image.png