Hi Nick,
Please find below some error messages that i could gather from the log:-
2020/03/11 07:19:36 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 07:19:36 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 07:19:36 DEBUG : HTTP REQUEST (req 0xc0c8e7af00)
2020/03/11 07:19:36 DEBUG : PUT /abcbucket/angebot.pdf?partNumber=1&uploadId=ZWIyZTM3NDUzMTU4MzkwNzU3NjQ4OA HTTP/1.1
Host: s3-edc.corpintra.net
User-Agent: rclone/v1.51.0-082-g0c6f14c6-beta
Content-Length: 108129
Authorization: XXXX
Content-Md5: 5gTX0oU9xNaxn0UKux+AMA==
X-Amz-Content-Sha256: fee4c85a4c2c2e2fcbe2641d1b6d13edd2c8efa2ea56f9d8f180e6a6ce67bc5a
X-Amz-Date: 20200311T061936Z
Accept-Encoding: gzip
2020/03/11 07:19:36 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 07:19:36 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 07:19:36 DEBUG : HTTP RESPONSE (req 0xc0c8e7af00)
2020/03/11 07:19:36 DEBUG : HTTP/1.1 404 Not Found
Connection: close
Content-Length: 356
Content-Type: application/xml
Date: Wed, 11 Mar 2020 06:19:36 GMT
Server: CloudianS3
X-Amz-Request-Id: 926ddfb7-ffff-1fff-a00a-ac1f6ba5aa2f
<?xml version="1.0" encoding="UTF-8"?>
NoSuchUpload
The specified multipart upload does not exist. The upload ID might be invalid, or the multipart upload might have been aborted or completed.926ddfb7-ffff-1fff-a00a-ac1f6ba5aa2f23VrgXaycPFvU_uw7QT-zzHdwYOrZ3VNssgJ4-DcHLg
2020/03/11 07:19:36 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 07:19:36 DEBUG : angebot.pdf: Cancelling multipart upload
2020/03/11 07:19:36 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
#########################################################################################################################
2020/03/11 06:58:32 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 06:58:32 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 06:58:32 DEBUG : HTTP REQUEST (req 0xc04ac06200)
2020/03/11 06:58:32 DEBUG : DELETE /abcbucket/AN000044441.pdf?uploadId=MWJlOWIzMTE1NjE1ODM5MDYzMTIwODM HTTP/1.1
Host: s3-edc.corpintra.net
User-Agent: rclone/v1.51.0-082-g0c6f14c6-beta
Authorization: XXXX
X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
X-Amz-Date: 20200311T055832Z
Accept-Encoding: gzip
2020/03/11 06:58:32 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 06:58:32 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 06:58:32 DEBUG : HTTP RESPONSE (req 0xc04ac06200)
2020/03/11 06:58:32 DEBUG : HTTP/1.1 204 No Content
#########################################################################################################################
2020/03/11 06:59:49 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 06:59:49 DEBUG : HTTP REQUEST (req 0xc060202400)
2020/03/11 06:59:49 DEBUG : DELETE /abcbucket/20200310083007.pdf?uploadId=MTYyNGEyMTE1ODE1ODM5MDYzODkxMTM HTTP/1.1
User-Agent: rclone/v1.51.0-082-g0c6f14c6-beta
Authorization: XXXX
X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
X-Amz-Date: 20200311T055949Z
Accept-Encoding: gzip
2020/03/11 06:59:49 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 06:59:49 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 06:59:49 DEBUG : HTTP RESPONSE (req 0xc05f830700)
2020/03/11 06:59:49 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 06:59:49 DEBUG : HTTP RESPONSE (req 0xc060202400)
2020/03/11 06:59:49 DEBUG : HTTP/1.1 204 No Content
Date: Wed, 11 Mar 2020 05:59:49 GMT
Server: CloudianS3
X-Amz-Request-Id: 2d269d74-ffbb-1fff-a7f9-ac1f6ba5d11f
2020/03/11 06:59:49 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 06:59:49 ERROR : 20200310083007.pdf: Failed to copy: multipart upload failed to upload part: NoSuchUpload: The specified multipart upload does not exist. The upload ID might be invalid, or the multipart upload might have been aborted or completed.
###################################################################################################################333
<?xml version="1.0" encoding="UTF-8"?>abcbucket/RELEASE_86935431_Doc_2001071042_20200310105331.pdfabcbucketRELEASE_86935431_Doc_2001071042_20200310105331.pdf"b8a377213f75c8801fdb02f6ffdbc170-1"
2020/03/11 07:18:45 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 07:18:45 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 07:18:45 DEBUG : HTTP REQUEST (req 0xc10b8d1f00)
2020/03/11 07:18:45 DEBUG : HEAD /abcbucket/technicalspecs.pdf HTTP/1.1
User-Agent: rclone/v1.51.0-082-g0c6f14c6-beta
Authorization: XXXX
X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
X-Amz-Date: 20200311T061845Z
2020/03/11 07:18:45 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2020/03/11 07:18:45 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 07:18:45 DEBUG : HTTP RESPONSE (req 0xc10be20c00)
2020/03/11 07:18:45 DEBUG : HTTP/1.1 204 No Content
Date: Wed, 11 Mar 2020 06:18:45 GMT
Server: CloudianS3
X-Amz-Request-Id: 926dbc16-ffff-1fff-a00a-ac1f6ba5aa2f
2020/03/11 07:18:45 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2020/03/11 07:18:45 ERROR : technicalspecs.pdf: Failed to copy: multipart upload failed to finalise: InvalidPart: One or more of the specified parts could not be found. The part might not have been uploaded, or the specified entity tag might not have matched the part's entity tag.
status code: 400, request id: 926dbc14-ffff-1fff-a00a-ac1f6ba5aa2f, host id:
Hope this helps.
Thanks and Regards
Pravesh Upadhyay