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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You should use GetMimeType block there.
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Great, these blocks return the directories:
using a not block on the mimetype test should return files only
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Well you needn't type dir mime type there.
Please check properties.
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Yes 
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I can't say how long you can access it, but you still can access /Android subdirs.
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