@admin
I have now upgrade to version 20170424. The new version did not solve the issue. When attaching a file in Gmail (or uploading a file in a browser dialog), I do not have alternatives to browse folders in the phone and does not allow other than photo&music files to be chosen. Just predefined photo&music folders. I added Google Drive and it is now visible in the choices, but does solve the issue either. So still cannot choose a .gpx file.
Have you found the reason for this and is there a way to get this solved?

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