EXTRA_INITIAL_URI works for ACTION_OPEN_DOCUMENT but not for ACTION_OPEN_DOCUMENT_TREE.
You can put the uries of documents the user previous choosed.
For ACTION_OPEN_DOCUMENT_TREE you can let the picker open on primary partion or de secondary (removable sd card) without using that extra. Only on Android Q+ i think.
There is nothing to let the latter open in the directories you want as far as i know.
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