I also had this problem with attaching various files downloaded using email or internet. The core problem with the issues seems to be around the file permissons. When a file is downloaded it has only permission to read in local format for some reason. The workaround I used to get the file to show was:
Open terminal
devel-su
*root password*
cd /home/nemo/Documents/ (or wherever file is located)
chmod 777 file123.pdf (whatever file name is called)
This should change the permissons of the file to read/write access and you should be able to send it from then. It however does open read write access to anyone so if you plan on using SSH be careful when using this command. While not ideal it does work.
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