Uploading a file in chunks - range headers

[Chiyo-no-sake]

I am trying to perform the upload of a file in chunks, splitting the file into multiple requests.
I've been using the following request but the server always responds with '205 Reset Content' and in the end the file contains just the latest sent chunk. It seems to be threating the request as a standard PUT request.

I assume it is either me doing something wrong or the server ignoring "range" headers.
Here is the request corresponding to the first chunk being sent. This is a PUT request since it was made to overwrite a file.
I've omitted tokens and I've put the binary chunk contents in the body.
I've also tried sending the full file size in the range header in the place of '*', without results.
Thank you in advance

PUT /.../c00d7009-cedb-4dca-b62c-cb143d4f695f HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate, br
Accept-Language: it-IT,it;q=0.9,en-US;q=0.8,en;q=0.7
Connection: keep-alive
Content-Length: 2097152
Host: localhost
Origin: http://localhost:5173
Referer: http://localhost:5173/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: cross-site
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
authorization: DPoP <...>
content-range: bytes 0-2097151/*
content-type: application/octet-stream
dpop: <...>

[joachimvh]

The server currently does not support splitting up your data when writing to a file.