Allow admins/moderators to add/rename/delete documents to posts of the group user.
Issue #2760 was marked as a duplicate of this issue.
Currently it is only possible to add documents to the post using the post form. Please also allow users to upload documents to group posts on the details page
fixed by commit 2756db2fa90b07a40dbb4cc06b73d350ea97a8f3
please check the branch if the bug is fixed
it seems that the branch contains an implementation for our api to upload and get documents from group posts.