EACCES Denied (Permission Denied) While accessing pictures from external SD card - android

java.io.FileNotFoundException: /storage/extSdCard/DCIM/Camera/20160312_173247.jpg: open failed: EACCES (Permission denied)
How to Overcome this Problem: It happens only when accessing the picture from External SD Card. I already provide the Permission like READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE.
The code i need is uploading image from the gallery(picture either from InternalStorage or External Storage) without any error or exception

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It works fine if the directory is empty and create those files from app.
If I want to read or edit those files already exist will cause error:
W/System.err: java.io.FileNotFoundException: /storage/emulated/0/Download/app_Folder/test.txt: open failed: EACCES (Permission denied)
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targetApi 30
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java.io.FileNotFoundException: /cache/test/test.txt: open failed: EACCES (Permission denied)

I am trying to copy the file from /storage/emulated/0/test.txt to /cache/SH_DIR/ via android user application ,
getting error like below
java.io.FileNotFoundException: /cache/test/test.txt: open failed: EACCES (Permission denied)
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EACCES(permission denied) when tried to access /system/build.prop even after storage permission and SU

i'm new to kotlin and android i'm trying to read build.prop from /system for that i'm accessing root by using
Runtime.getRuntime().exec("su")
and i also gave storage permission(i have done all the stuffs needed to access storage that need to work on Android 10 like fileProvider and such things)
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private fun filecreator(): String {
val ensy= Environment.getRootDirectory()
val filess =File("$ensy","build.prop")
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msg: android.system.ErrnoException: open failed: EACCES (Permission denied)
stacktrace: java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.airbender.c2/com.airbender.c2.MainActivity}: java.io.FileNotFoundException:
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thanks

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