Files saved to the File tab of the Send menu can be opened with other apps.
Open in other apps
1. Select a file in the Files tab of the Send menu.
2. Tap (⋮) ellipsis icon next to the Send button at the bottom.
3. Tap Open in....
4. Select the desired app from the list of apps. The file will launch in the selected app.
Depending on the file type, apps installed on your device may be disabled in a list of apps.
If the app you want to open the file in does not support a feature to open in other apps, it will not appear in a list of apps.