Error saving PDF from third apps

[forofo]

Having Document-Viewer like default PDF app in Samsung with Android 6.1, this error when trying to save PDF files from third apps :

Intent { act=android.intent.action.VIEW dat=/storage/emulated/0/Download/myfile.pdf typ=application/pdf flg=0x400000001 cmp=org.sufficentlysecure.viewer/org.ebookdroid.ui.viewer.Viewer.Activity }

Reinstall Document-Viewer cannot solve the problem.

Is there any solution?