there's something wrong... according to your https://community.appinventor.mit.edu/uploads/default/original/3X/4/0/40cd49dd497957af9973789392bc0b679d1ca8f6.jpeg I should not need any permission to write and read a text file generated by the app from /Download. In fact testing under appinventor it does ok!
Building the apk, when reading if there is no file, the app stops telling "file not found" but if I hand copy the file into /Download it stops telling "no permission.."; and that's also ok.
But when writing the text file in /Download (where is not yet present) the apk stops, telling "no external storage permission granted ..etc" ; that's not good, I should not need any permission to do that so why this message?
Furthermore, the scope should only set the default base locations, on android 11.. You said to set screen 1 scope to share or legacy, but apart setting the correct path (which in my test is ok) I don't need any permission..
So, I fear it is the appinventor builder itself (and not android 11) which is forbidding.. As said, under appinventor testing I can perfectly write and read the files from /Download
