Android - not able to attach a file in email

Question

By default, files saved to the internal storage are private to your application and other applications cannot access them (nor can the user).

I am able to see the fi

Answer 1

When you try to attach file from internal storage, GMail writes an error to the log:

ERROR/Gmail(...): file:// attachment paths must point to file:///mnt/sdcard. 

E-mail application would show you the attached file even if it didn't physically exist.

As for an external storage, documentation says that:

Every Android-compatible device supports a shared "external storage" that you can use to save files. This can be a removable storage media (such as an SD card) or an internal (non-removable) storage.

That means you don't have to worry about device not having an external storage at all. Still, external storage can be unavailable at times. Refer to http://developer.android.com/guide/topics/data/data-storage.html#filesExternal