Some basics on Android storage system

I understand. Can this file explorer move files, folders, rename, edit text files?

Yes, it does use the default text editor though.

I think the question here should be, how to save and access files from the (AI2) app when AI2 is targeting API 30 (targetSdkVersion = 30).


Before the update we used to use the following paths:

  1. Companion: file:///mnt/sdcard/AppInventor/assets/
  2. APK: file:///android_asset/
    Now, what paths do we need to use? I actually did not understand much. So if anybody could help....
    I need to use those paths to show a HTML File that's already uploaded in the app inventor


1 Like

I've added a full overview of the Android storage system - Scoped / Shared Storage (targetSdk=30, Aug 2021) - at the end of my guide.


I have added another detail to my overview (top right, see pink box) and thus completed the overview.
( I hope. :wink:)

File Export to csv
Files Acces with file component
SAF: App Inventor implementation of Storage Access Framework
Permissions problems again
File not found with new version of App Inventor
Files file path (yet again)
Save or storage pdf
How do you choose files from ASD and export them?
How do you import data from file on API30, API31?
Copy to shared Folder "Download" when using TaifunFile not works
TableView Extension Versions 3 and 4 by @Ken
Download a file to ASD and replacing a file already there
EFile extension works with Companion but not with the compiled app
I want to open a pdf file in app inventor
Question about Files, Scopes and Android Levels (US and EU)
Best method for storing and reading a folder that contains around 11k images with total of 1Gbyte
Εrror 2101:Τhe file/filename.txt coult not be found
How do I create a separate folder in external storage?
Time to RESET Forum / Documentation
Storing a simple file outside of the application specific directory (ASD)
Canvas are not saved
Android 11 issue related to cordova
File - readfrom filename dont work
Taifun FileList method not showing all the files in shared storage
Image is not save in phone
Taifun FileList method not showing all the files in shared storage
Save issue on samsung s20
Sharing csv file
Illegal Character In Path At Index... How to save canvas
How do you copy file (taifunfile copyasync) to folder in internal storage (android 11)?
List Documents folder with android 11
No guarda el archivo TXT
Illegal Character In Path At Index... How to save canvas
How do you save in gallery?
No guarda el archivo TXT
How can i convert a jpg file to pdf file?
No se puede compartir archivos, Error 908: The permission WRITE_EXTERNAL_STORAGE has been denied
Read file from phone memory
CloudDB.StoreValue Block not accepting file from Shared folder
SAF: App Inventor implementation of Storage Access Framework
Ask for permission
How do you copy non media files from the Download folder to the app folder?
Error 908: The permission read_external_storage has been denied
Reading fields from a csv file
Files Acces with file component
Changes in APK?
La aplicacion no permite guardar imagenes (Canvas.SaveAs issue)
Non riesco più a far caricare il file CSV dalla mia app
Error 908: Permission Denied
Problem to save Canvas as Image and Upload it to server with SDK > 30
Reading CSV in App Inventor
Create My App Album
File and Directories
Activity Starter pdf open failed
Rejection of license
Taifun File extension still works?
How to request and grant MANAGE_EXTERNAL_STORAGE permission
MFile - a modified version of Sunny's `EFile` extension - Shared folders - storage permissions - Android 11+

#off topic
@Anke may I know how did you made this Flow chat , I mean which website are you using to make this flowchart

You can use


Thank you Anke.This chart and information are perfect and very useful...

1 Like

I made it (the adaptations) with →


Really, you have perfectly depicted the storage components and their relationship, thanks @Anke

1 Like

Hi Anke, Mny thks to come back to his issue.
As i was able to save and not read, i suspected something like that. But your synoptic(overview) is crystal clear !
Have a nice WE

1 Like

This post is very interresting and i learned a lot.
But I don't undertand i used the app below to try understandind where are files for differents scope.

file is stored in /storage/emulated/0/Android/data/ `packageName/files/filename

I have an error when write file:
android_asset/filename could not be created !

File exists, i can read it, but with a file manager i don't succed to find it so i don't know where it is stored...

same as Cache

same as Cache

file is stored in /storage/emulated/0/filename
I can know it exists, i can delete it, but I can't read it ! app bugs and stop...

T2File1.aia (65,8 Ko)

Is someone could help me to understand ?

If you are asking for help, I recommend you to make it as easy for others to be able to help you ...
You probably will get more feedback then...

which means in your case post a screenshot of your relevant blocks...

To download the aia file, upload it to App Inventor, open it, do some bug hunting for you, etc... this takes time, and most people will not do that...
Thank you.

did you read the first post in this thread? here it is

you will have to store it in a valid directory for shared storage, which is for example /Download, /Documents, /DCIM, /Music


Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by icon24 Taifun.

That means it's impossible to show those files in a file manager !?

Ok, but it's strange we are able to write a file in a location we can't read from no ?

correct, see also the documentation Storage

which Android version are you using for your tests?
any screenshot of your relevant blocks?
how did you test? using the companion app? using the apk file? try again using the apk file...


Yes, that would really be strange. But this is not the case, I'm sure.
Post your blocks and the aia (or a test aia). Also mention the Android version you're testing on and whether it's with Companion or the APK.

Sorry, i realise that the aia file i shared in my post had to many blocks to understant what happen.
so you will find here a very simplest one.
shared_File.aia (34,0 Ko)

fisrt button to save file in shared (directly in emulated/0)
second one to check file exist
and third one to read it.

when I test it, file is saved and i can check it, but when i try to read it app bugs ans stops.
same in companion or with apk

I can see and open it with my file manager:

Android version: 10 QKQ1.191014.001 on redmi 7A

There are some bugs with the File comp. Try with FileScope = Legacy instead of Shared.