How to use --directories-to-pull to save files created by app in Firebase Test Lab

I'm using Firebase Test Lab to run integration tests of my app written in Flutter. I would like to pull all files created by the app and save it in the results bucket. It seems like the --directories-to-pull argument is what I need: https://cloud.google.com/sdk/gcloud/reference/firebase/test/android/run#--directories-to-pull

I'm using the following code to run my tests:

gcloud firebase test android run \
    --type instrumentation \
    --app build/app/outputs/apk/debug/app-debug.apk \
    --test build/app/outputs/apk/androidTest/debug/app-debug-androidTest.apk \
    --timeout 5m \
    --directories-to-pull /sdcard,/data/local/tmp

However, when using the argument --directories-to-pull /sdcard,/data/local/tmp some files are missing in the results bucket. Especially the logcat file is missing which is really important for debugging.

Without the --directories-to-pull argument I see the following results in my bucket:

With --directories-to-pull /sdcard,/data/local/tmp I only see the following results in my bucket:

Questions:

• How do I pull all data created by the app and save it in the results bucket?
• Am I using the --directories-to-pull argument correctly?
• Why are there fewer files in my results bucket when using the --directories-to-pull argument?
• The documentation states that one can use --directories-to-pull /storage. However, this results in an error saying that the path /storage is not known. Why is that?