[Python] Slack files.completeUploadExternal no uploading files to the Slack

Since the slack file.upload is going to be depreciated, I was going to make new the methods work.

The first one works as:

curl -s -F files=@test.txt -F filename=test.txt -F token=xoxp-token -F length=50123 https://slack.com/api/files.getUploadURLExternal


and returns

{"ok":true,"upload_url":"https:\/\/files.slack.com\/upload\/v1\/CwABAAAAXAoAAVnX....","file_id":"F07XXQ9XXXX"}


The second request is:

curl -X POST \ -H "Authorization: Bearer xoxp-token" \
-H "Content-Type: application/json" \
-d '{
"files": [{"id":"F07XXXXXX", "title":"Slack API updates Testing"}],
"channel_id": "C06EXXXXX"
}' \
https://slack.com/api/files.completeUploadExternal


With the second request, I get 200 OK responses.

{"ok":true,"files":[{"id":"XXXXXXX","created":XXXXXXXX,"timestamp":XXXXXXXX,"name":"test.txt","title":"Slack API updates Testing","mimetype":"","filetype":"","pretty_type":"","user":"XXXXXXXXX","user_team":"XXXXXXXXX","editable":false,"size":50123,"mode":"hosted","is_external":false,"external_type":"","is_public":false,"public_url_shared":false,"display_as_bot":false,"username":"","url_private":"https:\/\/files.slack.com\/files-pri\/XXXXXXXXX-XXXXXXX\/test.txt","url_private_download":"https:\/\/files.slack.com\/files-pri\/XXXXXXXXX-XXXXXXX\/download\/test.txt","media_display_type":"unknown","permalink":"https:\/\/XXXXXXXX.slack.com\/files\/XXXXXXXXX\/XXXXXXX\/test.txt","permalink_public":"https:\/\/slack-files.com\/XXXXXXXXX-XXXXXXX-XXXXXXXX","comments_count":0,"is_starred":false,"shares":{},"channels":[],"groups":[],"ims":[],"has_more_shares":false,"has_rich_preview":false,"file_access":"visible"}],"warning":"missing_charset","response_metadata":{"warnings":["missing_charset"]}}


Questions and problems: 1- How do I determine the length= in the first request (files.getUploadURLExternal ) 2- Even though I have provided the channel_id the file is still not getting uploaded on the Slack channel.

Documentation: https://api.slack.com/methods/files.completeUploadExternal https://api.slack.com/methods/files.getUploadURLExternal

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