Q: Evolution e-mail displays "Operation not supported" or "folder contents could not be displayed"when trying to save an attachment

Answer

When trying to save an attachment in Evolution, you may see an error like this one:

This error occurs because Evolution lost track of where you normally save attachments, and is trying to use an empty/null value for the folder name, which is unsupported. You can click OK to dismiss the error, and then select your home directory from the list on the left hand side of the window. Then navigate to where you wish to save the attachment.

After you successfully save an attachment, Evolution should no longer display this error.