Last night I could no longer post photos from Dropbox on message boards on an Android mobile device using the "Attach files" function. Now I can only do it through the "Insert image" function in the tool bars. Don't recall being notified that was changing. I use Chrome as my broswer on my Android phone and desktop pc.
ETA: I have been using Dropbox for many years and this is very frustrating. Other than photo storage, message board posting is my principal use of Dropbox.