This is strange. I hope you are testing in compiled Apk and not in companion.
I used that (DeepHost's) extension in one of my app, and it works. May be you can try with SAF extension.
Yes, I am indeed trying it in compiled APK
Im a stranger to it, maybe you could demonstrate us how?
I agree
@The_K_Studio Let me suggest you to keep the extension in its core functionality i.e to download files to ASD and remove the not working features for newer Android versions again.
Taifun
SAF is complicated for me as well, I need to look into the documentation if it can be done using it.
BTW, i am talking about this extension.
https://community.appinventor.mit.edu/t/saf-app-inventor-implementation-of-storage-access-framework
Yes I will consider this if it doesn't work for all android version, but before that let me try testing it.
SAF for what? 
It does grant you access to user specified folder but still I don't think you'll be able to use Download Manager to download files in that folder.
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My only concern is why is it working for me only, and not for others. If it doesn't work for me either then I would not have added custom download path block.
Yes, that's really more than strange. Something is messed up with your device. Do a factory reset and try again. And/or try on another device with Android 11+. It will not work!
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Probably device specific silly behavior.
That shouldn't amuse Google, given all of its obsession with restrictions. 
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