I forget to mention that direct child's id should be obtained using GetTreeDocumentId method.
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Sorry, I used the wrong block 
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OK that all works. 
Is there no way then, in order to get started, other than the user going into their file manager and granting a permission, to get the root or other folder (tree)? (Open Document Tree)
Perhaps a uri for the ASD ?
I can see how one can traverse through a file list to find sub (folders) trees, and then list files again and so on. An image component accepts a content uri to display an image. Is this going to be the same for other components needing a file?
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No, user must grant access through Documents Picker.
I am not sure about this.
Image component works fine.
Same should be correct for audio and video player.
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Understood 
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SAF is only needed for → non-media files. Media files (jpg, png, mp3, m4a, mp4,...) can be accessed from all paths (outside of the ASD or privateDir) with READ permission.
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The question was just about the content uri being read by other components, e.g. it works with the image component:
not had a chance to test some of the others yet.
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Could you please provide an example of how one uses the flags in order to set persistent permissions? I presume this saves the user having to visit the document picker again when restarting the app?
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With this extension you really have to bite through and some users might lose teeth in the process. 
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I am prepared to champion those users, in order to save their teeth ;), and ask Sunny how all the various elements of this extension work.
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Sure, here it is:
Also data gets kind of binded to the app and you don't lose access to it even after multiple reboots.
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Epic work 
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Thank you..
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What is the syntax for setting an initialDir?
Whatever I put in here, I am just taken to the last location I selected in the document picker ?
Ah, i just tried a full uri and this worked, e.g.
content://com.android.externalstorage.documents/tree/primary%3A/document/primary%3AMusic
opened at the Music folder
will this part be the same on all devices:
content://com.android.externalstorage.documents/tree/primary%3A/document/primary%3A
If I select the ASD I get a different path:
content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata%2Fedu.mit.appinventor.aicompanion3%2Ffiles/document/primary%3AAndroid%2Fdata%2Fedu.mit.appinventor.aicompanion3%2Ffiles
this is all using the companion...
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Yes, it doesn't matter whether there is an empty string or a special path there.
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... and you cannot select
- the root dir of the external storage
/storage/emulated/0and /Download
But you can select /Downloads.
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If anyone want to create a
empty folder after selecting the in "open Document Tree" by using "create document" .
then mimetype is following
....
vnd.android.document/directory
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I was also hoping that these blocks would return a list of just files, but it also returns directories. I must be missing something? (I also tried around the other way using the IsTreeUri block, but that also returns files and directories)...
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As I said,
But you cannot select this path / dir.
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