Actually, it has not been discussed, and I do not see an option to do attachments.
The "kitchen sink" toolbar is also missing from advanced mode in the mobile site.
I'll drop 4Nines a note and ask if it is something that can easily be added.
In the meantime, does your mobile browser have an option to "Request Desktop Site"?
Word from the admins is that they are planning to switch the forum to a different software package, but they don't have a time frame yet.
So at this point, posting photos is only available in the full desktop site.
But if your phone's browser has a feature to request the desktop site (most do), you can still do it.
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