Download Manager: How to access downloaded files?

Using /e/OS
1

After the system download manager has downloaded a file, how can I access it? If I click on the notification, the appropriate app opens, but I am not able to find the file in the file manager by the search function (nor by the shell find command via adb), I guess because it is in the cache (as shown in the app info).

I remember from old phones, one could launch the download manager directly, but in /e/ I cannot find this app.

Also failing in adb shell:

monkey -p com.android.providers.downloads.ui -v 500
am start -n com.android.providers.downloads.ui/.MainActivity
monkey -p com.android.providers.downloads -v 500
am start -n com.android.providers.downloads/.MainActivity

There seems to be no approriate activity.

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2 
adb shell am start-activity com.android.documentsui/.ViewDownloadsActivity

Theres an activity manager app that can create arbitrary activity icons in the launcher

3

Thanks for your answer!
After running the shell command or if I pick the respective activity in the activity manager app, the file manager opens, but I can’t see the downloads, just the normal screen as if I had started it normally.
Any further ideas?