Dropbox upload session append - incorrect offset

Hey,

First of all, thanks for the quick response! Well that's what I thought! The error indeed states that the first call supposetly sends 8mb data. I made another test example, which is more simple, and I still get the same error. And when I dump the first chunk, it says it's 4mb.. here look at this (I removed unnecessary code):

var max_chunk_size = 4 * 1024 * 1024;
var stuResponse = {};
var httpService = new http();
httpService.setUrl("https://content.dropboxapi.com/2/files/upload_session/start");
httpService.addParam(type="header", name="Dropbox-API-Arg", value="#serializeJSON({
  "close" : false
})#");
httpService.addParam(type="body", value="#all_chunks[1]#");
var result = httpService.send().getPrefix();

if(structKeyExists(result.ResponseHeader, 'Status_Code') && result.ResponseHeader['Status_Code'] eq '200'){
  upload_doc_session = deserializeJSON(result['filecontent'])['session_id'];
}

var stuResponse = {};
var httpService = new http();
httpService.setUrl("https://content.dropboxapi.com/2/files/upload_session/append_v2");
httpService.addParam(type="header", name="Dropbox-API-Arg", value="#serializeJSON({
  "cursor" : {
    "session_id" : upload_doc_session,
  "offset" : max_chunk_size
},
  "close" : false
})#");
httpService.addParam(type="body", value="");
var result = httpService.send().getPrefix();

if(structKeyExists(result.ResponseHeader, 'Status_Code') && result.ResponseHeader['Status_Code'] eq '200'){

}
else{
  here I get a 409 error that the first call is 8mb big.
}

When I dump "all_chunks[1]" it says it's 4mb length. Am I going a little mad here or am I just missing something?

The weird part is that when I do a test with i.e. the string "test" in the first start session, then I correctly get the error

that the last call was 4 bytes long. So I think maybe it's actually 8mb, but the java function len() gives 4mb...

but that would be so weird.