Share button doesn't always work correctly with other apps

[sfisher]

Share button doesn't work correctly with some external apps (Reversify for example and there are others). I also notice the shared file doesn't retain the original filename or the correct file extension of the original file. I assume this is why some apps don't open it correctly (or maybe a mime type isn't set).

It would be nice to retain the original filename even when the shared file is a new copy since it would be useful for finding an original file again later if the share is something like Snapseed. That way you have a clue what the original filename might be for an edited or derived file.