Android 7:
* fixed buttons (Exit, Context menu,
etc)
Android 6/7:
* If app does not download in background
- disable Power-saving mode (system Settings - Battery, menu button
"three dots")
* If app does not open the links in a
browser - reset App preferences (system Settings - Apps, menu
button "three dots")
Android 5/6/7:
* If app is no longer downloaded to
SD-card - select a folder in Settings - Downloading - Folder for
files - Access on SD-card