Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist

What is the problem you are having with rclone?

When using rclone copy to transfer files from a Google Drive remote to a Linkbox (now Telebox) remote, several files fail to copy. The error returned for each file is:

Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist

This issue consistently affects multiple files in the transfer operation.
I’ve verified that the files exist in the Google Drive source location and are accessible. The problem seems to occur during the second step of the upload process on the Linkbox side, resulting in a 500 server error.
Would appreciate any guidance or if this is a known issue with the Linkbox backend integration.

Run the command 'rclone version' and share the full output of the command.

rclone v1.69.3
- os/version: Microsoft Windows 11 Pro 24H2 24H2 (64 bit)
- os/kernel: 10.0.26100.4349 (x86_64)
- os/type: windows
- os/arch: amd64
- go/version: go1.24.3
- go/linking: static
- go/tags: cmount

Which cloud storage system are you using? (eg Google Drive)

Linkbox (now Telebox)

The command you were trying to run (eg rclone copy /tmp remote:tmp)

rclone copy -P --log-level ERROR gka:Materials/Uni/Test/Pics te:Materials/Uni/Test/Pics

The rclone config contents with secrets removed.

[gka]
type = drive
client_id = xxx
client_secret = xxx
token = {"access_token":"xxx"}
team_drive = 

[te]
type = linkbox
token = xxx

A log from the command with the -vv flag

2025/06/16 23:31:19 ERROR : 354_large_h02_1j.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:20 ERROR : 352_large_h02_1h.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:22 ERROR : 356_large_h02_1l.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:23 ERROR : 355_large_h02_1k.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:24 ERROR : 353_large_h02_1i.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:24 ERROR : 357_large_h02_1m.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:25 ERROR : 358_large_h02_1n.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:26 ERROR : 360_large_h02_1p.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:28 ERROR : 359_large_h02_1o.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:29 ERROR : 361_large_h02_1q.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:31 ERROR : 362_large_h02_1r.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:31 ERROR : 363_large_h02_1s.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:32 ERROR : 364_large_h02_1t.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:33 ERROR : 365_large_h02_1u.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:34 ERROR : 366_large_h02_1v.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:35 ERROR : 368_large_h02_1x.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:36 ERROR : 367_large_h02_1w.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:37 ERROR : 369_large_h02_1y.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:39 ERROR : 371_large_h02_1za.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist
2025/06/16 23:31:40 ERROR : 372_large_h02_1zb.png: Failed to copy: Update second step failed: Linkbox error 500: user upload file not exist

not sure this is a bug?

perhaps linkbox is a read-only backend?

rclone backend features linkbox: | grep -E 'Copy|Move'
                "Copy": false,
                "DirMove": false,
                "Move": false,

and

Add read only backend for linkbox

Initially, all files could be uploaded successfully using the Linkbox backend, but after some time, uploads started failing with the user upload file not exist error. Also, the backend is able to write files — it isn’t fully read-only, since uploads worked at the beginning.

Edited: This error seems to happen only when copying files that have never been uploaded to Linkbox account before. Initially, uploading works fine for all files, but after a period of time (or when attempting to re-upload), this error starts occurring for newly transferred files.