Lost my stuff because i changed my name

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    I changed my minecraft username and lost my stuff. I found a thread from feb 1st 2021 - feb 7th 2021 and it was closed on march 9th 2021 by 'Raymond'. In the thread Raymond explained a few steps to follow if i lost my stuff due to a username change. I followed all the steps and tried uploading the world.zip file and even the extracted world file but i get an error message every time. I attached an image of it. Please tell me what to do here

    The solution would be to use the legacy upload. The legacy upload can be used by holding down ctrl and then pressing the upload button. Please note that the legacy upload still has a restriction of 200MB max. 198 and 199 can also be browser, or internet related.