We are trying to develop an integration to upload file from a different application to solidworks pdm. We are successful in uploading the file using the following method.

api/{vaultName}/authenticate

api/{vaultName}/changeset/create

api/{vaultName}/files/{changesetId}/upload (With appropriate file in request with details and content of the file)

api/{vaultName}/files/{changesetId}/finishadd

api/{vaultName}/checkin/addfiles/