Struggling with post multipart/form-data including file and attributes - python-3.x

Question

I'm using Requests for a program that interfaces with a server that has a well documented API, except for file upload which uses multipart/form-data including file and attributes. Every other request using JSON and that has not been an issue.
The docs say that the header must contain content-type:multipart/form-data but I have realized that requests does that automatically. It then lists a number of text attributes in the form of author.fullName: Heidi Walker and then a file attribute in the form of content: [physical file]
I have a working example in Postman but I can't get it to work with Requests. This is the code I have:
header = {
'session_id':sID,
}
# These are the required text attributes from the API docs + the actual file
fileInfo = {
'author.fullName' : 'Fred',
'category.guid' : 'xxx',
'description' : 'Data Sheet',
'format' : 'PDF',
'private' : 'false',
'storageMethodName' : 'FILE',
'title ' : 'Test Datasheet',
'content': open(path, 'rb')
}
resp = requests.post(url + '/files', headers = header, files = fileInfo)
I keep getting back 400 errors from the server.
Also, is their any way to see the formatted body of the request? So I can check that the boundary tags have been added correctly and compare to what Postman created?
I have been struggling with this for way to long so any help would be greatly appreciated.
Update:
I was able to enable logging with the logging module as outlined on this page: https://requests.readthedocs.io/en/master/api/
Inspecting the body of the request I see:
Content-Disposition: form-data; name="author.fullName"; filename="author.fullName"\r\n\r\nFred\r\n
What I would like to see (working postman example) is:
Content-Disposition: form-data; name=\"author.fullName\"\r\n\r\nFred\r\n
It seems that filename="author.fullName" is being inserted on every line.

Answer 1

Finally got this working, here is the code if anyone else is struggling with this.
multi = MultipartEncoder(
fields={'author.fullName' : 'Automatic Upload',
'category.guid' : 'XXX',
'description' : 'Data Sheet',
'edition' : '01',
'format' : 'PDF',
'private' : 'false',
'storageMethodName' : 'FILE',
'title ' : title,
'content': (fileName, open(path, 'rb'), 'application/pdf')}
)
mpHeader = {
'Content-Type': multi.content_type,
'session_id':sID,
'cache-control': "no-cache",
}
resp = requests.post(url + '/files', headers = mpHeader, data = multi)