Unable to delete file on SD Card

Device - Android 9, emulator

2020-12-15 02:23:27.689 1646-1646/com.amaze.filemanager.debug W/System.err: java.io.FileNotFoundException: /storage/1A15-3009/Android/AugendiagnoseDummyFile1 (Permission denied)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at java.io.FileOutputStream.open(Native Method)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.amaze.filemanager.filesystem.FileUtil.isWritable(FileUtil.java:754)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.amaze.filemanager.filesystem.FileUtil.isWritableNormalOrSaf(FileUtil.java:801)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.amaze.filemanager.utils.MainActivityHelper.checkFolder(MainActivityHelper.java:414)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.amaze.filemanager.utils.MainActivityHelper.deleteFiles(MainActivityHelper.java:624)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.amaze.filemanager.ui.dialogs.GeneralDialogCreation.lambda$deleteFilesDialog$0(GeneralDialogCreation.java:221)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.amaze.filemanager.ui.dialogs.-$$Lambda$GeneralDialogCreation$bRN4EnckyLzY8w3uQEbZKv5Foxk.onClick(lambda)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.afollestad.materialdialogs.MaterialDialog.onClick(MaterialDialog.java:410)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at android.view.View.performClick(View.java:5637)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at android.view.View$PerformClick.run(View.java:22429)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at android.os.Handler.handleCallback(Handler.java:751)
2020-12-15 02:23:27.690 1646-1646/com.amaze.filemanager.debug W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
2020-12-15 02:23:27.691 1646-1646/com.amaze.filemanager.debug W/System.err:     at android.os.Looper.loop(Looper.java:154)
2020-12-15 02:23:27.691 1646-1646/com.amaze.filemanager.debug W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6119)
2020-12-15 02:23:27.691 1646-1646/com.amaze.filemanager.debug W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
2020-12-15 02:23:27.691 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
2020-12-15 02:23:27.691 1646-1646/com.amaze.filemanager.debug W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

Start by reproducing deletion of a file on an SD card with the Android 9 emulator configuration described. Read FileUtil.java at lines 754 and 801, then follow MainActivityHelper.java at lines 414 and 624 and GeneralDialogCreation.java at line 221. Done means the reported SD-card deletion failure is resolved and the relevant behavior is verified.