`crypt` and many other remotes do not support `{ep}lno` policy of `union`

What is the problem you are having with rclone?

I'm trying to overcome the 25k file limit on OpenDrive (wrapped by crypt), so I created a union remote with multiple folders so the folder with the least amount of objects is always elected. This is my config (redacted where applicable):

[Crypt]
type = crypt
remote = OpenDrive:
filename_encryption = standard
directory_name_encryption = true
password = [REDACTED]
server_side_across_configs = true
filename_encoding = base32768

[OpenDrive]
type = opendrive
username = [REDACTED]
password = [REDACTED]
chunk_size = 50Mi

[Union]
type = union
upstreams = Crypt:Backups/1 Crypt:Backups/2 Crypt:Backups/3
action_policy = lno
create_policy = lno
description = Used to overcome OpenDrive's 25k file limit

What is your rclone version (output from rclone version)

rclone v1.69.1
- os/version: debian 12.10 (64 bit)
- os/kernel: 6.1.0-32-arm64 (aarch64)
- os/type: linux
- os/arch: arm64 (ARMv8 compatible)
- go/version: go1.24.0
- go/linking: static
- go/tags: none

Which cloud storage system are you using? (e.g. Google Drive)

OpenDrive -> Crypt -> Union

The command you were trying to run (e.g. rclone copy /tmp remote:tmp)

rclone copy -vv rclone.conf Union:

A log from the command with the -vv flag (e.g. output from rclone -vv copy /tmp remote:tmp)

The key problem is at NOTICE: Number of Objects is not supported for upstream Crypt, treating as 0

2025/04/08 09:39:51 DEBUG : rclone: Version "v1.69.1" starting with parameters ["rclone" "copy" "-vv" "rclone.conf" "GPhotosBackup:"]
2025/04/08 09:39:51 DEBUG : Creating backend with remote "rclone.conf"
2025/04/08 09:39:51 DEBUG : Using config file from "/home/ferferga/.config/rclone/rclone.conf"
2025/04/08 09:39:51 DEBUG : fs cache: renaming child cache item "rclone.conf" to be canonical for parent "/home/ferferga/.config/rclone"
2025/04/08 09:39:51 DEBUG : Creating backend with remote "Union:"
2025/04/08 09:39:51 DEBUG : Creating backend with remote "Crypt:Backups/1"
2025/04/08 09:39:51 DEBUG : Creating backend with remote "Crypt:Backups/3"
2025/04/08 09:39:51 DEBUG : Creating backend with remote "Crypt:Backups/2"
2025/04/08 09:39:52 DEBUG : Creating backend with remote "OpenDrive:[REDACTED]"
2025/04/08 09:39:52 DEBUG : Creating backend with remote "OpenDrive:[REDACTED]"
2025/04/08 09:39:52 DEBUG : Creating backend with remote "OpenDrive:[REDACTED]"
2025/04/08 09:39:52 DEBUG : Starting OpenDrive session with ID: [REDACTED]
2025/04/08 09:39:52 DEBUG : Starting OpenDrive session with ID: [REDACTED]
2025/04/08 09:39:52 DEBUG : Starting OpenDrive session with ID: [REDACTED]
2025/04/08 09:39:54 DEBUG : union root '': actionPolicy = *policy.Lno, createPolicy = *policy.Lno, searchPolicy = *policy.FF
2025/04/08 09:39:54 DEBUG : rclone.conf: Need to transfer - File not found at Destination
2025/04/08 09:39:54 NOTICE: Number of Objects is not supported for upstream Crypt, treating as 0
2025/04/08 09:39:54 NOTICE: Number of Objects is not supported for upstream Crypt, treating as 0
2025/04/08 09:39:55 DEBUG : [REDACTED]: Uploading chunk 0, size=5273, remain=0
2025/04/08 09:39:57 DEBUG : rclone.conf: md5 = 151fa835fdb3e5a836bec3098a8c4502 OK
2025/04/08 09:39:57 INFO  : rclone.conf: Copied (new)

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Start by reproducing the Union configuration with Crypt upstreams and the lno action and create policies, then trace the NOTICE that Number of Objects is unsupported for Crypt. Compare the behavior of Union, Crypt, and the upstream remote described in the report. Done means the lno policy works with this configuration without treating the upstream object count as zero.