Confluence Server: attach_content() uses PUT on child/attachment, causing 405

[berke581]

Since the Cloud/Server split in the v5, Server.attach_content() sends a single PUT request. Confluence Server doesn't support PUT on this endpoint, only GET/POST, so every attachment upload fails with 405 Method Not Allowed.

In 4.7.0, this worked via GET (check existing attachment) plus POST (create/update).

Steps to reproduce:

from atlassian import Confluence

confluence = Confluence(url="https://<server-instance>", token="<PAT>")
confluence.attach_file("/tmp/file.csv", page_id="page_id")

Expected:
File attaches successfully (as in 4.7.0).
Actual:
HTTPError: HTTP 405 on PUT .../rest/api/content/page_id/child/attachment.

Environment
atlassian-python-api 5.0.3 (broken since 5.0.0)
Confluence Server

Are we aware of this issue?