I am using web pages on which gpx files can be uploaded. The web page has a Attach a File button that opened Dialog to choose file "type"(photos, videos, documents). When choosing "Documents" I could browse folders and choose gpx files.
Now on Android 7 the dialog box has only photos, videos and music file type to choose from. And no option to browse folders. Even if the gpx file is copied to the photo folder, gpx type file is not shown and cannot be therefor chosen. On Gmail app attaching files is limited exactly the same way.
This is probably due to Android 7 security being stricter and it is limiting file types and folders to work on. What work arounds there are to get the Android 6 functionality back?