POST the Attachment with API

[laoris]

I'm trying to post file in Attachment. Aсcording to other topics: i need to send json with file encoded to base64. I found some php code, but it doesn't work, even php. When i remove field "file", response - 200, but there is no any file attached.
My python code also fail in this field.

Example php:
$postFields = json_encode(array(
'name' => 'tr.txt',
'publishDate' => date('Y-m-d'),
'type' => 'application/octet-stream',
'size' => 356297,
'file' => ',' . base64_encode(file_get_contents('F:\project\common \tr.txt')),
));

Response:
HTTP/1.1 400 Bad Request
Access-Control-Allow-Methods: POST, GET, PUT, PATCH, DELETE
X-Powered-By: PHP/7.1.33
X-Status-Reason: Params 'field' and 'parentType' not passed along with 'file'.
Content-Length: 0
Connection: close
Content-Type: text/html;charset=UTF-8

But as the result, i must write it on python.

[yuri]

I recommend to open browser console F12 > network tab and post attachment (from EspoCRM). You will see which fields you need to send. I believe you need to use 'contents' instead of 'file'.

[laoris]

'contents' helped - the file is attached!
but now it is broken and no view

in php:
$postFields = json_encode(array(
'contents' = ',' . base64_encode(file_get_contents('F:\project\common \tr.txt')),
));

in python:
with open('s.pdf', 'rb') as file:
f = f',{(base64.b64encode(file.read()))}'
and so on.. json.dumps()..
Results are equal.

[laoris]

I try to send file using this function:

with open('s.pdf', 'rb') as file:
f = f'data:application/pdf;base64,{base64.b64encode(file.read()).decode() }'

{"name": "s.pdf", "type": "application/pdf", "role": "Attachment", "size": 356297, "field": "attachments", "contents": f}

But still attached file is unreadable(
The value of "contents" similar to the value of "file" from brousers request. And i realy don't know what to do(

.

[esendino]

Does anyone know how to solve this?

As other persons I'm getting the message: Params 'field' and 'parentType' not passed along with 'file'.

I tried many things but unable to solve it