You'll notice
Useful2 Signal2
Automounted /net paths now count as network paths for file reads, writes and attachments.
What's wrong with this entry?
Anonymous. No account, no email.
What
File read, file write and attachment handling previously treated only UNC paths (\\server\share or //server/share) as network paths. They now share one check that also recognises automounter paths of the form /net/<host>/..., and the attachment error text says so.
Evidence
is a network path (UNC or /net autofs), which is not supported.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.