amaze crashes when sharing a file with target save as

steps to reproduce:

• open FDroid, select an app
• share the apk file, with target "save as" from Amaze
• in Amaze, push the blue button on the lower right to confirm where to put it

expected behavior

• the app's apk file should be copied to the selected directory

observer behavior

• crash

versions:
Amaze 3.3.2 FDroid
FRdoid client 1.5.1 Fdroid
LineageOS 15.1-20190410-microG-mido

logcat:

java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:353)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.lang.NullPointerException: uri
at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:128)
at android.content.ContentResolver.openInputStream(ContentResolver.java:950)
at com.amaze.filemanager.filesystem.FileUtil$1.doInBackground(FileUtil.java:209)
at com.amaze.filemanager.filesystem.FileUtil$1.doInBackground(FileUtil.java:198)
at com.amaze.filemanager.utils.application.AppConfig$1.doInBackground(AppConfig.java:122)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
... 3 more

Start at com.amaze.filemanager.filesystem.FileUtil.java around lines 198-209, where the logcat shows ContentResolver.openInputStream failing during the background copy. Reproduce the F-Droid sharing flow and inspect how the URI reaches FileUtil. Done means the APK is copied to the selected directory without a crash.