Slack reporter sending message without attachment

What ?
Slack reporter sending message without attachment.

Using command: sudo docker run --rm -i --mount type=bind,source="$(pwd)",target=/glue/wrk/ owasp-glue ruby bin/glue -f slack --slack-token xoxb-TOKEN --slack-channel owasp-glue-test -t Dynamic -T /glue/wrk/output.json --mapping-file zaproxy --finding-file-path /glue/wrk/glue.json -d

On Slack Channel message :

OWASP Glue test run completed - See attachment.

From console :

Loading scanner...
Logfile nil?
calling scan
Running scanner
Mounting ... /glue/wrk/output.json
Mounting target: /glue/wrk/output.json
Checking about mounting /glue/wrk/output.json with #Glue::DockerMounter:0x000000016617b8
In Docker mounter, target: /glue/wrk/output.json became: ut.json ... wondering if it matched .docker
Checking about mounting /glue/wrk/output.json with #Glue::FileSystemMounter:0x00000001661218
Checking about mounting /glue/wrk/output.json with #Glue::GitMounter:0x00000001660de0
Checking about mounting /glue/wrk/output.json with #Glue::URLMounter:0x00000001660b38
Processing target.../glue/wrk/output.json
Running tasks in stage: wait
Running tasks in stage: mount
Running tasks in stage: file
Running tasks in stage: code
code - Dynamic - #Set:0x000000016ee1b8
Running tasks in stage: live
Running tasks in stage: done
Starting Contrast Severity Filter
Minimum:
No minimum found, skipping filter.
Have 24 items pre ZAP filter.
Have 24 items post ZAP filter.
channel=CQRJCQLRH, message=bot_id=BQV5AC325, subtype=bot_message, text=OWASP Glue test run completed - See attachment., ts=1575303887.000200, type=message, username=bot, ok=true, ts=1575303887.000200
owasp-glue

Why is there no attachment in the message? Maybe the command is incorrect?

[stale]

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